Toxic stress and children’s
outcomes
African American children growing up poor are at
greater risk of disrupted physiological functioning
and depressed academic achievement
Report • By Leila Morsy and Richard Rothstein • May 1, 2019

• Washington, DC

View this report at epi.org/164823

SECTIONS

Executive summary“Stress” is a commonplace term for hormonal changes that
occur in response to frightening or threatening events orconditions. When severe, these changes are termed “toxic”
stress and can impede children’s behavior, cognitive
capacity, and emotional and physical health.
Frightening or threatening situations are more sustained
and are experienced more frequently by African Americanand socially and economically disadvantaged children,
who also have less access to protective resources that can
mitigate their stress to tolerable levels. This report
describes the relative frequency of toxic stress by race andsocial class, and shows how it depresses children’s
outcomes and contributes to the “achievement gap.” We
conclude by suggesting policy and practicerecommendations that can reduce the cognitive,
behavioral, and health harm that toxic stress provokes.

1. Introduction • 3
2. What is toxic stress?
•4
3. Racial and social classdifferences in theprevalence of toxic
stress • 8
4. Outcomes for children
exposed to chronicallystressful conditions• 10
5. Plausible causes ofdisproportionate toxic
stress among African
American children • 14
6. Policy
recommendations • 16
7. Conclusion • 22

Key findings
Social class and childhood stress. Beginning ininfancy, lower social class children are more likely tohave strong, frequent, or prolonged exposure to major
traumatic events, the frightening or threatening
conditions that induce a stress response.

About the authors • 23
Endnotes • 23
References • 26

Income and childhood stress. The lowest-income
children are more likely to be exposed to frighteningor threatening experiences than other children.
Race and childhood stress. Black children are more
likely than white children to be exposed to frighteningor threatening experiences.
Childhood stress and depressed outcomes.
Independent of other characteristics, children exposed
to more frightening and threatening events are more
likely to suffer from academic problems, behavioral
problems, and health problems.
These attributes present challenges to children’s schooland life trajectories.

1

Policy recommendations
Ultimately, larger social change is needed to address the economic and social conditions
at the root of children’s toxic stress. But given that these larger social problems will not be
remediated easily or quickly, policymakers must find other ways to improve current
outcomes for children who are at high risk for toxic stress. We suggest the followinginterventions in policy and practice:
Provide supports for parents. To promote protective parenting—which can mitigate
children’s toxic stress—we recommend implementation of support programs such ashome visits and/or therapy services by community health workers, nurses, and other
health specialists. These programs can offset the damaging effects of exposure tofrightening or threatening conditions by building the capacity of caregivers to provide
children with safe, stable, and nurturing relationships that help to develop children’s
adaptive and positive coping skills.
Train school staff to support children. To prepare trauma-informed staff and improve
how preschools and schools support children exposed to frightening or threatening
experiences, adults in these settings should receive training to help them understandhow such experiences affect students’ learning and behavior.
Address racially disparate policies and practices in schools. Schools should be
especially careful to eliminate in-school experiences that can be so stressful that they
themselves can generate a toxic stress response. Racially discriminatory discipline
policies—indeed, racially disparate treatment of any kind, even if unintentional—caninduce stress in children.
Engage health care professionals in screening and treatment. Health care
professionals can contribute to preventing and treating the harmful effects offrightening or threatening experiences. All children should be routinely screened forsuch experiences. Health care professionals should be trained to understand how
frightening or threatening experiences impact children’s cognitive, behavioral, andphysical health outcomes, and screen and treat children for any resulting
complications.

2Introduction
Since the Coleman Report’s release in 1966, education policymakers have grappled withthe fact that, on average, African American children’s academic and behavioral outcomesare depressed relative to those of white children (Coleman et al. 1966). Because African
American children disproportionately come from low-income families, it is generally
understood that the disadvantaged social and economic conditions from which many ofthese children come to school predict these depressed outcomes.
Seeking to improve outcomes for these children, education reform efforts have focused
mostly on how higher-quality teaching can overcome the force of social and economic
challenges; however, these efforts have failed to make a meaningful dent in theblack–white achievement gap. Many policymakers continue to be perplexed thatbackground characteristics should be so powerful, so resistant to offset by betterschooling. Their puzzlement, however, results from a failure to understand the pathways
by which socioeconomic disadvantage translates into worse performance and from a
failure to devote sufficient attention to addressing these pathways directly. Some attention
has been paid to differences in parenting styles, early childhood literacy experiences,
health conditions like lead poisoning or asthma, and some other backgroundcharacteristics, each of which prevents disadvantaged children from taking full advantageof what even the best schools have to offer (Rothstein 2004; Morsy and Rothstein 2015a,
2015b, 2016). But much remains unexplained or insufficiently understood.

Toxic stress and whole child policy
One of the plausibly powerful factors that blocks better performance for disadvantaged
children is toxic stress response. The research literature is rich with discussions of how
toxic stress response in children predicts depressed outcomes across a range of areas,
including academic performance, behavior, and health.1 And yet educators have only
recently begun to pay attention to the relationship between toxic stress and how children
fare in school, and to consider interventions that could possibly diminish its power.
In this report, we draw upon research in medicine, public health, epidemiology, economics,sociology, and psychology to show that across educational, behavioral, and healthoutcomes, children exposed to more frightening and threatening events are at a greaterrisk of the damaging effects of toxic stress.
We then offer recommendations for interventions that can help mitigate the effects offrightening and threatening events on children—reducing the likelihood they will develop
toxic stress and suffer depressed outcomes.

Methodological notes
This report does not attempt to isolate the effect of toxic stress on children’s outcomes.

3

The factors affecting disadvantaged children—including toxic stress, risk factors for toxic
stress, and consequences of toxic stress—overlap and are often interdependent. There
are no available databases by which the relative importance of toxic stress as a cause oflowered cognitive and behavioral outcomes can be assessed. But informed professionals,
whose work we present in this report, judge that it is an important cause for a significant
share of disadvantaged children.
Furthermore, this research reports population averages. Not all children exposed tofrightening and threatening events will suffer from depressed outcomes. Some willachieve at rates that are higher than typically observed. Such achievement is not
impossible for children with high exposure to frightening or threatening events, but it isless likely.

What is toxic stress?
“Stress” is a natural response to frightening or threatening events or conditions. These canbe of greater or lesser severity and the resulting stress can lead to changes in behavior,emotional health, and cognitive capacity. We refer to the stress induced by infrequent
events or conditions of lesser severity as “tolerable stress.” Stress can also be madetolerable when severe conditions are experienced in the presence of various emotional
supports (“protective factors”) upon which otherwise secure children can rely. Tolerable
stress can contribute to better performance if individuals react by heightening their focus
on the fright or threat without distraction. But the stress can become toxic when the events
or conditions precipitating it are severely frightening or threatening—especially when they
are sustained or frequently repeated—and when protective factors are insufficient to
mitigate the stress to tolerable levels. Then, toxic stress can produce not heightened focus
but the opposite result, a decrease in performance levels.2

How threatening experiences stimulate stress
A normal response to a frightening or threatening situation is the production of adrenaline,
cortisol, and related hormones by the amygdala, hypothalamus, and adrenal and pituitary
glands. When released, these hormones can affect almost every tissue and organ in the
body (Dhabhar 2009, 216; HHP 2018). They send the brain a signal to attack the threat or
escape from it. This “fight or flight” response is an essential survival mechanism in the faceof a frightening or threatening situation. The stress hormones increase the body’s heartrate, blood pressure, and breathing. They dilate the blood vessels and the bronchioles in
the lungs, so that more oxygen reaches the brain, muscles, and vital organs. This sharpens
a person’s senses, including sight and hearing. Until the danger passes, cortisol keeps aperson on high alert, limiting access to the parts of the brain responsible for memory anddeliberative decision-making. Instead, a person’s attention is placed on responding
aggressively to the danger or escaping from it. After the threat is over, the body’s
physiological and behavioral functions can return to normal.
In these ways, the physiological and behavioral response is protective in the face of4

infrequent and tolerably stressful situations. But when frightening or threatening situations
occur too frequently, stress becomes chronic and disrupts the brain’s and body’s
responses. The body can over- or underproduce necessary hormones, and the body’s
physiology can fail to return to normal. This is a toxic stress response (Shonkoff et al. 2012,
236).
Examples of events that can produce toxic stress—because they are severe, frequent, or
sustained—are psychological, physical, and sexual abuse; having a parent or close family
member be incarcerated; witnessing domestic violence; physical or emotional neglect;family financial hardship; homelessness; exposure to neighborhood violence;
discrimination; parental divorce or separation; placement in foster care or kinship care;
property loss or damage from a fire or burglary; or having a family member become
seriously ill or injured, be hospitalized, or die.3
Toxic stress and its associated hormone disruption can stunt brain growth and diminish
brain activity in the prefrontal cortex, a region that controls executive function, learning,memory, attention, anxiety, and emotional regulation (Shonkoff et al. 2012, 236; Kim et al.
2013). It can elevate blood pressure for a sustained and unhealthy period and disrupt the
metabolic system, and it can compromise the immune system, increasing vulnerability toinfection and inflammation (Evans and Kim 2013, 44).

Protective factors
Exposure to frightening or threatening events or conditions does not necessarily result in
toxic stress. Children’s susceptibility to toxic stress can be reduced by protective
neighborhood, family, or school conditions, as these can help children develop effective
self-regulation, i.e., the ability to respond constructively to emotions and to manage
behavior in response to frightening or threatening events.4 Conversely, negative
neighborhood, family, or school conditions can diminish protective factors and compoundtoxic stress.

Neighborhood
Living in a neighborhood that residents experience as orderly can be protective. Living
in a neighborhood that children and their parents are more likely to experience as
disorderly—with characteristics such as excessive litter, vandalism, deteriorated andovercrowded housing, graffiti, noise, public drug and alcohol use, and conflict withneighbors in close quarters—can exacerbate children’s toxic stress response to frighteningor threatening events and impede parents’ ability to protect children from that response.
Living in a neighborhood that residents experience as more orderly can be protective(Evans 2004, 86, citing Evans 2001; Kleinhans and Bolt 2014, 420). Noise, litter, graffiti,
conflict with neighbors, or any of these factors, when isolated or occasional, are unlikely tobe frightening or dangerous but, when compounded, they can exacerbate a feeling ofdisorder and lack of control over one’s environment.
In neighborhoods that are perceived as orderly, it is also more likely that parents have safe

5

spaces to congregate, improving their sense of social connection (Shonkoff 2012, 17305).
By supporting residents’ overall sense of collective efficacy, such neighborhoods canenable parents to help their children cope with frightening or threatening conditions(Sampson, Raudenbush, and Earls 1997, 924; CWW 2013; Evans and Kim 2013). Suchneighborhoods improve parents’ sense of well-being, supporting their ability to be warm
and responsive toward their children and thus helping the children to regulate their stressresponses. As Robert Sampson has demonstrated, collective perceptions of neighborhood
disorder are self-fulfilling prophecies, predicting future neighborhood poverty andsegregation levels. Therefore, perceptions of neighborhood disorder impact not only
residents’ present lived experience, but by perpetuating racial and economic segregation,
also influence the trajectory of their neighborhood, and thus influence the residents’ ability
to manage threatening or dangerous experiences (Sampson 2009, 24).
High concentrations of parental incarceration in a neighborhood can not only diminish
the protective capacity of affected families, it can also erode the overall protective
capacity of the neighborhood. Parental incarceration, more concentrated in segregated,
low-income African American neighborhoods, contributes to the disruption of normalfamily support systems (Kramer and Hogue 2009, 182; Morsy and Rothstein 2016).5
Incarceration often means the loss of an income for a family, and the ensuing economic
instability can be disruptive for children and their parents.
This is a problem of both race and felony status: In terms of employment, theconsequences of a criminal record are greater for black workers than for white workers.
White job candidates who report a criminal conviction on an employment application get
called back for interviews more frequently than demographically similar African American
job candidates without a conviction. White prospective employees are favored even morein comparisons with black prospective employees when all applicants have criminal
convictions (Pager 2003).
When a parent is incarcerated, the remaining parent may have to work longer hours tomake up for the loss of income while also having to maintain primary responsibility for thecare of the family and the household. The strain of normal daily pressures can beexacerbated by having an incarcerated family member. Partners and children of theincarcerated are more likely to suffer from mental health problems: For example, childrenof incarcerated fathers are 51 percent more likely to suffer from anxiety, 43 percent more
likely to suffer from depression, and 72 percent more likely to suffer from post-traumaticstress disorder. And because of the emotional toll of having a spouse or partner
incarcerated, a parent may be less able to give his or her child the positive attention andsupervision that is supportive of healthy mental, behavioral, and physical development(Morsy and Rothstein 2016).
In segregated neighborhoods, where the incarceration of young black men isconcentrated, the negative effects of imprisonment—deteriorated mental health andincreased poverty, homelessness, and housing mobility—are multiplied and can damage
the social fabric of a community, thus reducing the chances that the community can
prevent children’s stress from becoming toxic (Sampson and Loeffler 2010; Von Hoffman2015).

6

Family
When children have a network of stable, responsive relationships and caregivers with thefinancial, psychological, and social resources to nurture and protect them, they are more
likely to cope successfully with frightening or threatening events. Such resources facilitate
the return to normal of a child’s stress hormones (Shonkoff et al. 2012, 235). Above, in the“Neighborhood” section, we discussed some of the factors that influence protective
capacity in both families and neighborhoods. Below we discuss additional factors thatpredict whether families will have the capacity to act as protective buffers againstchildren’s toxic stress.
Family household stability is a protective factor. Living in an uncrowded home, or having
fewer life transitions like moving homes or having family members move away from home,
can protect children against developing a toxic stress response.6 When children
experience transitions, or have to cope with poor living conditions, they must find ways toadapt in order to mitigate their stress response. The effect of such events and conditions
are cumulative, and when children experience fewer of them, they can more easily makesuch adjustments and decrease their risk of a toxic stress response.
Parental emotional stability is a protective factor. Emotional stability of parents can also
protect children from toxic stress in response to frightening or threatening childhood
experiences. Parents who are less stressed themselves are more likely to be able to listen,
to problem-solve, to give and receive affection, and to provide children with cognitive
stimulation, such as by reading, asking questions, encouraging discussion, playing games
indoors and out, or doing arts and crafts projects with their children (Gershoff et al. 2007,
87, 95: Table 5). Such practices constitute the warm and responsive parenting that can
provide a buffer against toxic stress. Unpredictable and inconsistent schedules can be
distressing for children and can exacerbate a vulnerability to toxic stress, as can physicalpunishment (Gershoff 2016; Odgers and Jaffee 2013). Parents who are not stressed
themselves are less likely to use corporal punishment to control their children’s behavior
or as a reactive response to misbehavior. They are also more likely to establish predictable
and consistent schedules, including rules and routines around children’s TV watching,meals, and bedtimes (Gershoff et al. 2007, 89–90: Figures 2 and 3).
Family economic security can also be protective. Economic strain can lead to material
hardship, including food insecurity, residential instability, and inadequacy of medical care,all of which can be associated with increased stress for parents as well as for children(Wadsworth et al. 2008; Gershoff et al. 2007, 87, 95: Table 5).
Stable parental employment can be a protective factor. Parents who are regularly
employed are more likely to have strong and supportive social networks and less likely toexperience worry and strain (Lindsay 2010; Paul and Moser 2009; Roelfs et al. 2011, 841).
As a result, they are likely better able to parent their children in ways that promote selfregulation and adaptive coping behaviors. Such parenting is characterized by being
consistent, predictable, and nurturing of children’s self-confidence and self-worth (Odgers
and Jaffee 2013, 37–38).

7

Parental experiences of racial discrimination can diminish their protective capacity.
Frequent and systematic racial discrimination, even when subtle or difficult to prove, has adamaging effect on psychological well-being. While systematic discrimination or verbal
attacks are obvious and common, even more commonplace is chronic, everyday
discriminatory treatment (frequently termed “micro-aggression”) that takes the form of
frequently unintentional, subtle behavioral or verbal exchanges. Racial discrimination
exacerbates psychological distress that results from adverse life events, job difficulties,
and financial strain. Psychological distress makes it more difficult for parents to have ahigh-quality and nurturing relationship with their child, thereby decreasing their ability toprotect their child from developing a toxic stress response to frightening or threatening
childhood experiences (Murry et al. 2001, 921).

SchoolA school’s climate can contribute to protection against toxic stress. Children are better
able to develop the skill of self-regulation in schools and classrooms that are emotionally
supportive of and responsive to all students, and where there are positive
teacher–student relationships, with teachers maximizing students’ feelings of autonomy,
influence, competence, and social connectedness (Wang 2009, 242; Kaplan, Gheen, andMidgley 2002, 203–204; Solomon et al. 2000). Intentional schoolwide strategies to create
a positive school climate and nurture social-emotional learning can provide children with afavorable environment for the self-regulation of stress hormones.

Racial and social class differences in
the prevalence of toxic stress
Popular discourse frequently conflates lower social class status with low income. This issociologically naïve. For children, lower social class status is the result of many interacting
conditions—not only low family income, but inadequate household wealth, low parental
educational levels, low parental occupational status, the intergenerational persistence of
these conditions, and membership in a minority group suffering systematic discrimination.
Nonetheless, most data sources do not report the full range of these conditions, andsometimes report family income alone.
Beginning in infancy, lower social class children are more likely to have strong, frequent, or
prolonged exposure to major traumatic events, the frightening or threatening conditions
that induce a stress response (Shonkoff et al. 2012, 240, 242; Halfon et al. 2017, S70–S78).
Table 1 shows that the lowest-income children are more likely to be exposed to frighteningor threatening experiences than other children. A study of children from families withincomes below $20,000 (in 2003, 2004, or 2005, when families were surveyed) foundthat such children were 18 percent more likely than children from higher-income families tohave been exposed to a frightening or threatening experience; 15 percent more likely tohave been exposed to two frightening or threatening experiences; and 74 percent more
likely to have been exposed to three or more frightening or threatening experiences.

8

Table 1

Low-income and African American children are more
likely to have stressful childhoods
Share of kindergartners exposed to frightening or threatening childhood
experiences, by family income and by race
Number of frightening or threatening experiences:

0

1

2

≥3

≥ $20,000

50%

26%

15%

10%

< $20,000

36%

30%

17%

17%

% more/less likely

-28%

18%

15%

74%

White

52%

22%

14%

12%

Black

36%

32%

18%

14%

% more/less likely

-31%

45%

29%

21%

By family income

By race

Notes: Data are based on a study sample of 1,007 children who were born between 1998 and 2000 andwere age 5 at the time these data were collected (2003–2005). Frightening or threatening experiences
include physical abuse, sexual abuse, psychological abuse, neglect, living with someone with substanceabuse problems or mental illness, seeing their caregiver treated violently, or having a parent incarcerated.
Source: Manuel E. Jimenez et al., “Adverse Experiences in Early Childhood and Kindergarten
Outcomes,” Pediatrics 137, no. 2 (2016), 1–10, https://doi.org/10.1542/peds.2015-1839, Supplemental Table 6

Table 1 also shows that black children were 45 percent more likely than white children tohave been exposed to one frightening or threatening experience; 29 percent more likely
to have been exposed to two frightening or threatening experiences; and 21 percent more
likely to have been exposed to three or more such experiences.7 This incongruity in partreflects the intersection between race and income: Since children from low-income
families are more likely to experience frightening or threatening events, and since African
American families fall disproportionately lower on the income distribution than whitefamilies,8 it is more likely that black children will experience such events (Gould 2019;
Wilson and Rodgers 2016).

9

Outcomes for children exposed tochronically stressful conditions
Children exposed to frequent or sustained frightening or threatening events that are likely
to induce toxic stress have more depressed academic, behavioral, and health outcomesthan other children.

Association of stress with children’s cognitive
outcomes
Figure A summarizes research comparing the academic outcomes of children exposed tothree or more frightening or threatening life experiences with the academic outcomes ofchildren not exposed to such experiences.
The share of children in their last month of kindergarten who could not independently
read a simple book was nearly 50 percent greater for those who had been exposed tothree or more frightening or threatening life experiences than for those who had not been
exposed to frightening or threatening life experiences but were otherwise similar. The
share of children who had below average reading and math skills was more than 70
percent and nearly 80 percent greater, respectively, for those who had been exposed tofrightening or threatening experiences than for those who were otherwise similar but who
had not been exposed to any frightening or threatening experiences. Nearly 90 percent
more did not understand basic conventions of print. More than twice as many did notunderstand a story that was read to them, and nearly 2.4 times as many were unable toname the letters of the alphabet (Jimenez et al. 2016, 5).9

Association of stress with children’s behavioral
outcomes
Figure B summarizes research comparing the behavioral outcomes of children exposed tofrightening or threatening life experiences with the behavioral outcomes of children not
exposed to such experiences.
The share of children in their last month of kindergarten who had social problems (such as
acting younger than is appropriate for their age, being clingy, having difficulty getting
along with peers, and preferring to play with younger children) was over 150 percent
greater for children who had been exposed to frightening or threatening experiences thanfor those who were otherwise similar but with no such experiences (Jimenez et al. 2016, 6:
Table 5).10 The share of children who displayed attention problems in the classroom wasover 200 percent greater for those who had been exposed to frightening or threatening
life experiences than for those who were otherwise similar but with no such experiences(Jimenez et al. 2016, 6).11 The share of children who were aggressive and broke rules at

10

Figure A

Children with more stressful life experiences have agreater likelihood of suffering from academic
problems
Ratio of the share of kindergartners with three or more frightening or
threatening childhood experiences to the share of kindergartners with no suchchildhood experiences who have the condition

Unable to name letters
Unable to understand astory that is read to them
Unable to understand theconventions of print
Below average math skills
Below average reading
skills
Unable to read simple
books independently
0

0.5

1

1.5

2

2.5

3

Notes: Data are based on a study sample of 1,007 children who were born between 1998 and 2000 andwere age 5 at the time these data were collected (2003–2005). The study data cannot be used todetermine whether the poorer outcomes resulted from exposure to frightening or threatening
experiences, or from other conditions connected with low socioeconomic status. However, in this study,
comparisons were made across children who were similar in age, gender, race, maternal education, parent
relationship status, and household income—so there is a suggestion of causality. Children who had been
exposed to three or more frightening or threatening experiences were compared with children who had
had no frightening or threatening life experiences. Frightening or threatening experiences include physicalabuse, sexual abuse, psychological abuse, neglect, living with someone with substance abuse problems
or mental illness, seeing their caregiver treated violently, or having a parent incarcerated.
Source: Manuel E. Jimenez et al., “Adverse Experiences in Early Childhood and Kindergarten Outcomes,”
Pediatrics 137, no. 2 (2016), 1–10, https://doi.org/10.1542/peds.2015-1839, Tables 3 and 4

school was nearly 140 percent greater for those who had been exposed to frightening or
threatening life experiences than for those who were otherwise similar but with no such
experiences (Jimenez et al. 2016, 6).

Association of stress with children’s healthoutcomes
Figure C compares specific health vulnerabilities of children exposed to frightening or
threatening experiences with specific health conditions of children with no such
experiences.
The share of children who suffered from ear infections and acute respiratory infections
was greater by roughly 20 and 30 percent, respectively, for children who had been

11

Figure B

Children with more stressful life experiences have agreater likelihood of suffering from behavioral
problems
Ratio of the share of kindergartners with three or more frightening or
threatening childhood experiences to the share of children with no suchchildhood experiences who have the condition

Attention problems in theclassroom
Social problems

Aggression and rulebreaking
0

0.5

1

1.5

2

2.5

3

3.5

Notes: Data are based on a study sample of 1,007 children who were born between 1998 and 2000 andwere age 5 at the time these data were collected (2003–2005). The study data cannot be used todetermine whether the poorer outcomes resulted from exposure to frightening or threatening
experiences, or from other conditions connected with low socioeconomic status. However, in this study,
comparisons were made across children who were similar in age, gender, race, maternal education, parent
relationship status, and household income—so there is a suggestion of causality. Children who had been
exposed to three or more frightening or threatening experiences were compared with children who had
had no frightening or threatening life experiences. Frightening or threatening experiences include physicalabuse, sexual abuse, psychological abuse, neglect, living with someone with substance abuse problems
or mental illness, seeing their caregiver treated violently, or having a parent incarcerated.
Source: Manuel E. Jimenez et al., “Adverse Experiences in Early Childhood and Kindergarten Outcomes,”
Pediatrics 137, no. 2 (2016), 1–10, https://doi.org/10.1542/peds.2015-1839, Table 5

exposed to frightening or threatening experiences than for otherwise similar children who
had had no such experiences. The share suffering from eczema was 67 percent greater,
and the share suffering from viral infections was 73 percent greater.12 The share ofchildren suffering from obesity was close to 45 percent greater for children who had been
exposed to frightening or threatening experiences than for otherwise similar children withno such childhood experiences.13 The share of teenage girls who became pregnant wasmore than twice as great for those who had had frightening or threatening experiences
than for those who had not and were otherwise similar.14
Boys with more pronounced physiological indications of prolonged stress were more likely
to develop asthma.15

12

Figure C

Children with more stressful life experiences have agreater likelihood of suffering from health problems
Ratio of the share of children with three or more frightening or threatening
childhood experiences to the share of children with no such childhood
experiences who have the condition

Teen pregnancy (girls)
Viral infections
EczemaObesityAcute respiratory infections
Ear infections
0

0.5

1

1.5

2

2.5

Notes: Different rows in the figure compare children with different numbers of experiences with children
with no experiences. For ear infections, acute respiratory infections, eczema, and viral infections: Children
in this study were Swedish, and of similar age (10 years) and birth weight. They had been exposed to threeor more frightening or threatening experiences. They were compared with similar children who had nofrightening or threatening experiences (Karlén et al. 2014, e1454). For obesity: Children in this study were
under 21 years old and low-income. They had been exposed to four or more frightening or threatening
experiences. They were compared with children of the same gender and similar in age and ethnicity who
had had no frightening or threatening experiences (Burke et al. 2011, 411). For teen pregnancy: This study
compared girls who had been exposed to three or more frightening or threatening experiences with girlsof the same race, age, and education level who had had no frightening or threatening experiences (Hillis
et al. 2004, 323).
Sources: Karlén et al. 2015, Table 2; Burke et al. 2011, 411; Hillis et al. 2004, 323. For ear infections, acuterespiratory infections, eczema, viral infections: Jerker Karlén et al., “Early Psychosocial Exposures, Hair
Cortisol Levels, and Disease Risk,” Pediatrics 135, no. 6 (2015), e1450–e1457, Table 2, e1454. For obesity:
Nadine J. Burke et al., “The Impact of Adverse Childhood Experiences on an Urban PediatricPopulation,” Child Abuse and Neglect 35, no. 6 (2011), 408–413, 411. For teen pregnancy: Susan D. Hillis etal., “The Association Between Adverse Childhood Experiences and Adolescent Pregnancy, Long-Term
Psychosocial Consequences, and Fetal Death,” Pediatrics 113, no. 2 (2004), 320–327, Table 4, 323.

13

Plausible causes of disproportionate
toxic stress among African American
children
A frightening or threatening experience can lead directly to worse outcomes for children.
For example, frequent moves and unstable housing can result directly in excessive
absences that cause achievement to fall. But—as shown above—in addition to these direct
effects, a toxic stress response because of frightening or threatening conditions or eventsis independently likely to lead to worse outcomes.
Toxic stress may not be the only or even the most powerful reason that achievement
declines because of frightening or threatening events. Other factors may contribute todepressed outcomes. Racial discrimination and poverty increase the likelihood that lower
social class children will experience such adverse conditions. Residential housing
segregation exacerbates the likelihood that children will be exposed to some forms of
racial discrimination, poverty, and unstable housing. As far as we know, current research isunable to isolate the independent effects of racial discrimination, poverty, unstablehousing, or residential segregation, on toxic stress. But the research findings cited in theprevious section of the report suggest that each may be a contributing factor.
Below we examine the potential pathways by which discrimination and housing
segregation may lead to toxic stress response in children.

Discrimination
As attention to police violence has increased over the last few years—in response toincidents in Baltimore, Baton Rouge, Ferguson, and St. Paul (among many others)—there is
now a wider spotlight on what African American communities have long known: Interaction
between police and residents in African American neighborhoods of concentrated
disadvantage can be frequently contentious. Discriminatory criminal justice practices affectbystanding children. Indeed, African American children are more likely to be exposed topolice violence, racial profiling by law enforcement officers, and unwarranted attention by
police to their caregivers, even if the children themselves are not the victims of thesepolice practices. Such exposure increases the likelihood of children suffering from toxic
stress (Boyd, Ellison, and Horn 2016).
Discriminatory practices are not limited to the criminal justice system, but occur across allcontexts of life, including schooling. To understand whether nonwhite students are treateddifferently from their white peers because of their race, researchers must rule out otherfactors, not merely observe racial differences in treatment. A large body of evidence
supports the conclusion that, compared with otherwise similar white peers and for similar
infractions, black students are suspended more frequently, for longer periods of time, andreceive greater punishment (Nance 2015, 1068; Skiba et al. 2011). An African American

14

student from a low-income family is 10 percent more likely to be suspended than a white
student from the same school and grade level for a similar infraction. At 16 percent, thedifference in the rate of suspension is even greater between similar black and white
students who are not eligible for free or reduced-price lunch (Gordon 2018). Discipline ofblack children is more frequently complemented by the use of metal detectors, random
searches, and/or student referral to law enforcement, none of which are supportive of asafe and protective learning environment (Nance 2015, 1068).
Schools with a higher proportion of African American students tend to criminalize student
misbehavior. They have higher rates of suspensions and expulsions, while concomitantly
having a lower rate of students enrolled in services covered by the Individuals with
Disabilities Education Act and Section 504 of the 1973 Rehabilitation Act. These laws
codify certain behaviors as symptoms of medical conditions that interfere with student
learning, and require access to services that provide support to students with such
symptoms (Ramey 2015, 189, 196). When students who need these services are notenrolled in them, the students are more likely to express symptoms of medical conditions
that can mistakenly be viewed as criminal misbehavior by school staff. Failure to receive
appropriate services may increase African American children’s risk of suffering from toxic
stress.

Housing segregation
Many neighborhoods of concentrated poverty are disproportionately African American(Rothstein 2017). No other racial or ethnic group in the United States has lived in lowincome, racially segregated neighborhoods over multiple generations at such a rate
(Sharkey 2013).16 Residential racial segregation, the result of a history of deliberate federal,state, and local policies and practices, tends to dilute factors that can protect children
against developing a toxic stress response (Rothstein 2017).
In low-income African American segregated neighborhoods, it is more difficult to accesshealth care, and even more difficult to access high-quality health care (Hahn 2017, 3; Morsy
and Rothstein 2015a). It is harder to get around—public transportation is not as accessibleor reliable, increasing social isolation and restricting access to employment opportunities
beyond the immediate area. These factors are associated with parenting that results inless adult protective behavior (Hahn 2017).
In racially segregated black neighborhoods, men tend to experience high rates ofincarceration, which is damaging to the mental and physical health of those incarcerated,their children and other family members, and their neighbors (Morsy and Rothstein 2016;
Kramer and Hogue 2009, 182).
Segregation concentrates poverty (and, conversely, wealth, in white neighborhoods) bycontrolling who has access to resources. It restricts access to basic human needs.
Communities tend to adapt to poverty by adopting behaviors that are socially
dysfunctional. Joblessness, welfare dependency, substance abuse, single parenthood,and violence are concentrated in low-income segregated neighborhoods. Social

15dysfunction increases levels of strain in all adults, including parents (Massey 2004, 17).
Concomitantly, parents in low-income segregated neighborhoods have fewer social andfinancial resources to create buffers against difficult surrounding conditions. Because
parents are more likely to be under strain themselves, they are less likely to be able toparent in ways that support their child’s self-regulation, safeguarding the child against toxic
stress.

Policy recommendations
Clearly, the most effective way to reduce the greater likelihood of toxic stress in children
from racially segregated low-income communities is to eliminate theconditions—discrimination, poverty, and socioeconomic isolation—that support social
dysfunction, neighborhood violence, unstable housing, economic insecurity, and excessive
rates of incarceration, each of which can stimulate a toxic stress response; in combination,these conditions are even more likely to stimulate such a response. Short of that, social
work, educational practice, and health policy can attempt to strengthen the protective
factors that can prevent frightening or threatening events from provoking toxic stress in achild.

Recommendation: Promote protective parenting
Even in chaotic, low-income environments, parents and close adults can help to protect
babies and children from developing a toxic stress response by being responsive,
nurturing, supportive, and protective (Hillis et al. 2010, 20; CWW 2013, 21; Osher et al.
2018, 17). Support programs such as home visits and/or therapy services by community
health workers, nurses, and other health specialists can offset the damaging effects of
exposure to frightening or threatening conditions by building the capacity of caregivers toprovide children with safe, stable, and nurturing relationships that help to develop
children’s adaptive and positive coping skills (Garner 2013). Examples of such programs
are described below.

The ChildFIRST initiative: In-home interventions for at-riskfamilies
The ChildFIRST initiative is a program that seems to have succeeded in decreasing thedamaging impact of challenging environmental conditions on children through supportingstrong child–parent relationships. The program identifies at-risk families and aims to
improve the outcomes of children in these families with personalized, in-home, earlychildhood interventions. Parents and children receive home visits from mental healthclinicians who provide them with resources and support to promote a responsive andnurturing relationship between parent and child. Strong parent–child relationships canhelp to decrease children’s learning and behavioral problems, mitigate emotional
disturbance in children, and reduce the incidence of abuse and neglect.

16

The program has shown encouraging results. One evaluation found that the share ofchildren with language delays was smaller by 68 percent for children who received
ChildFIRST services than for a demographically similar group of children who received nosuch services. The share of children who were overactive or defiant, who acted
aggressively toward their peers, or who had other behavioral problems was smaller by 57
percent for children who received the ChildFIRST services. The share of mothers whoreported clinical levels of parenting stress was smaller by 52 percent for mothers who
received ChildFIRST services (Lowell et al. 2011, 193). This intervention seems to positively
impact how a child fares in school by promoting protective parenting that helps children
develop self-regulation.

Child–parent psychotherapy services
Another promising type of publicly provided support is child–parent psychotherapy inwhich parents and children jointly meet with a clinical psychologist to nurture a strong
emotional bond between parent and child. This type of therapy, designed to address
children’s exposure to traumatic events, helps parents support a child’s emotional
regulation by responding to their child’s stress signals. Sessions can take place at thehealth care provider’s work site or at the child’s home. They aim to promote feelings ofsafety and trust, improve parent and child self-regulation, and support developmentally
appropriate goals and activities (Lieberman and Van Horn 2009, 439; Lieberman, Ippen,
and Van Horn 2006, 914–915; Renschler et al. 2013, 120; CWW 2013, 10–11).

The Nurse Family Partnership: Nurturing theinfant–maternal bond
The Nurse Family Partnership (NFP) is a program in which registered nurses visit women
before and after childbirth, help coordinate physician and hospital visits, and provide
guidance on healthy behavior during pregnancy. Nurses continue their visits for two years
after delivery, helping mothers understand the infant–maternal bond, read baby andtoddler communication signals, and engage in activities that promote babies’ and toddlers’
healthy development. The nurses also teach mothers self-care strategies, how to plansubsequent pregnancies, and how to seek employment effectively.
Home visits by nurses trained in community medicine or child and maternal health improveparent–child interactions by helping parents provide more sensitive and responsive care(Olds et al. 2002, 493). Visits help decrease children’s exposure to child maltreatment, arisk factor for developing a toxic stress response (Eckenrode et al. 2017). By improving
children’s environment with better maternal health—including fewer subsequentpregnancies, and greater intervals between births—home visits create conditions that
protect against children’s toxic stress that can result from their exposure to frightening or
threatening experiences.

17

Recommendation: Prepare trauma-informed
school staff
While teachers cannot fix what has been caused by discrimination, poverty, andsegregation, there are school-based approaches that can offset some of the effects of
toxic stress on children’s academic achievement, behavior, and health.
To improve how preschools and schools support children exposed to frightening or
threatening experiences, adults in these settings should receive training to help themunderstand how such experiences affect students’ learning and behavior. Because
students might act in counterproductive ways in the classroom as a result of exposure tofrightening or threatening experiences, adults should be trained to respond appropriately
and to support students’ self-regulation skills and social and emotional learning. For
example, when a child is behaving in a confrontational way, or has withdrawn, adults candeescalate unproductive behavior by emotionally connecting with the child and removing
the child from the overwhelming context before redirecting the child toward schoolwork.
Staff should also be trained in how to communicate with caregivers and children who haveexperienced frightening or threatening situations by, for instance, providing them withconfidential ways to communicate with school staff. Adults in schools should support all
students (not just those who have experienced frightening or threatening situations) indeveloping strong relationships with adults and other students. This can include building
supportive teams around students of concern.
Such protective approaches should be integrated into the curriculum, daily academic andnonacademic activities, and how adults relate to children (Cole et al. 2013, 18–19; Blodgett
and Dorado 2016, 22). A focus on children’s social-emotional health can improve school
climate and create school and classroom conditions propitious for reducing children’s riskof poor social and behavioral outcomes (Blodgett and Dorado 2016, 17; Adelman andTaylor 2006).
To mitigate racially discriminatory practices in schools that can contribute to toxic stress inchildren, educators should understand the characteristics, prevalence, and effects ofracially biased school disciplinary practices. Teachers and administrators should collectand publicly report on school disciplinary data, including demographic information about
who is removed from classrooms and from schools, and for how long and on what basis.
Reflecting on these data and aggregating them at the district and state levels can help
educators challenge bias in schools. To contribute to better learning conditions forchildren and improve their academic, social, and behavioral outcomes, school staff shouldbe trained to offset school- and classroom-based racial discrimination. Training educators
to offset racial discrimination in schools can contribute to better school conditions forchildren, improving their academic, social, and behavioral outcomes.
To reduce the number of students—especially African American students—who areunjustly removed from schools, and to reduce the incidence of other intentional andunintentional racially discriminatory school discipline practices, civil rights agencies should
employ a disparate impact standard. By this standard, they would consider practices that18

result in race-based intentional or unintentional adverse impact on students, recognizingthat school policies and practices may be unlawful if their effects are racially biased, evenin the absence of discriminatory intent. Federal policy should create incentives foreducators, schools, districts, and states to develop or improve behavior management
approaches that mitigate racial bias and focus on keeping children in classrooms andschools (Losen 2011).
Two programs that show promise are described below. Careful replication of suchprograms with ongoing evaluation is warranted. To have the greatest impact on offsetting
the effects of children’s toxic stress response to frightening or threatening events andconditions, educators should adopt such approaches in schools of concentrated
disadvantage.

The Chicago School Readiness ProjectIn the Chicago School Readiness Project, preschool teachers received training in how to
support students’ self-regulation, including encouraging positive behavior anddeescalating conflictual behavior. Educators received the help of a mental healthconsultant in and out of the classroom to improve the classroom’s emotional climate andchildren’s social-emotional skills, to lower children’s level of conflict with their peers, and tominimize teacher stress (Raver et al. 2011, 365).
As educators addressed the symptoms of toxic stress and provided an environment thatwas protective, children in the program were able to sit quietly for longer periods of time,
follow directions more attentively, and have better impulse control. By improving students’
self-regulation, children in such environments gained skills in vocabulary, letter naming,and math (Ursache, Blair, and Raver 2012, 126; Raver et al. 2011).

Healthy Environments and Response to Trauma in Schools(San Francisco and Oakland)
The University of California, San Francisco, developed an initiative called Healthy
Environments and Response to Trauma in Schools, which operates in partnership with the
San Francisco and Oakland school districts. The initiative designs and implementsinterventions in schools for children who have experienced frightening or threatening
events; provides psychotherapy for these children; uses workshops and professional
development to build the capacity of parents and employees to help students; and helps
develop and implement trauma-sensitive district-level policies, such as universal behavior
referral forms, so that schools and districts are able to collect student behavior data anduse it to develop prevention strategies. These include having predictable classroom andschool routines, establishing school health or wellness centers, and incorporating regularcalming practices for students and staff (UCSF 2018a; OUSD 2014).
The program seems to have led to a decrease in serious school disciplinary events,
including a 43 percent decrease in events involving physical aggression. Students inparticipating schools were more engaged in their academic work, with a 27 percent

19increase in students spending time on academic work and a 36 percent increase in how
much time students spent in the classroom. Student attendance increased by 34 percent.
Children displayed fewer symptoms of toxic stress: they were better able to function indaily life, had a stronger capacity to identify and modulate their emotions, were better able
to relate to others and develop healthy relationships, and were less likely to display
symptoms of dissociation, in which children emotionally and mentally detachedthemselves from their present experiences and reality (Dorado et al. 2016, 171–172; UCSF
2018b).

Recommendation: Develop supportive healthpolicyRoutine screening for frightening or threatening
experiences
Health care professionals can contribute to preventing and treating the deleterious effects
of frightening or threatening experiences. All children should be routinely screened forsuch experiences. Health care professionals should be trained to understand how
frightening or threatening experiences impact children’s cognitive, behavioral, andphysical health outcomes, and screen and treat children for any resulting complications. To
that end, a standardized risk profile for children who have been exposed to frightening or
threatening experiences should be developed. This can help pediatric healthprofessionals make more accurate diagnoses and provide clearer treatment options(Harris et al. 2017).
High-quality initiatives in this area exist and warrant careful expansion or replication. Twoof these initiatives are described below.
The National Child Traumatic Stress Network. Using collaborative groups, liaison teams,
and information sharing, the National Child Traumatic Stress Network supports partnering
clinics and hospitals to develop and implement approaches to treating children who haveexperienced frightening or threatening events. The network collects data acrosspartnering clinics and hospitals to conduct research and disseminate information about
evidence-based practices, such as cognitive behavioral therapy, trauma assessments, andinterventions that develop children’s self-regulation (Van der Kolk 2011, A25; NCTSN
2018a, 2018b).
The Center for Youth Wellness, in partnership with the Bayview Child Health Center in
San Francisco, is a pediatric care center that applies research on how exposure tofrightening or threatening experiences impacts children. Children who are screened andfound to have been exposed to frightening or threatening experiences are treated withhealth, mental health, and behavioral interventions. These treatments include child–parent
psychotherapy, individual psychiatric care, and biofeedback, which is a way for children
and caregivers to identify what the symptoms of a toxic stress response feel like so thatthey can learn to offset them (Harris et al. 2017; CYW 2018).

20

School-based mental health services
High-quality school-based health centers offering mental health services are anotherprotective initiative to support children at risk of developing a toxic stress response. Suchcenters can be staffed by mental health professionals, including counselors, psychologists,
and nurses. School-based mental health center staff can offer psychological support in theform of psychological crisis intervention teams (mental health professionals who act
together to help a child cope with a psychiatric emergency), counseling, peer-to-peer
modeling of effective coping strategies, and parent education and support. Some
programs operate outside of the classroom—in a clinic on school grounds, forinstance—while other programs are part of the class curricula and are integrated into inclass teaching. Students can access mental health services to treat psychological issues,
including depression, anxiety, anger, conflicts, and family problems.
Evaluations of high-quality centers provide convincing evidence of their effectiveness(Kataoka et al 2012; Rones and Hoagwood 2000). Adolescents in schools with a mental
health center are up to 10 times more likely to initiate a mental health visit than otherwise
similar students with no such in-school resource (AAP 2004, 1841; Kaplan et al. 1998, 29).
School-based mental health centers are especially important for children in disadvantaged
schools who tend to need such services more than students from higher-income families,
and concomitantly have more limited access to professional mental health support thantheir higher-income peers (Bains and Diallo 2016, 15).
School-based mental health services are related to improvement in students’ grades(Suldo et al. 2014). Students who use school-based mental health services tend to start out
with a lower grade point average than those who never access the services. After
students begin using the services, their GPAs increase steadily over time (Walker et al.
2010, 255).

Medical–legal partnerships
Another model to offset the causes and consequences of pediatric toxic stress is
medical–legal partnerships in which physicians and lawyers collaborate to provide
underserved children with clinical pediatric services and legal advocacy. In thesepartnerships, medical health practitioners are trained to identify issues that can beaddressed by legal aid attorneys.
Medical–legal partnerships can help families mitigate the consequences of frightening or
threatening experiences or prevent them altogether. For instance, to address learning
disabilities, in some cases perhaps a result of toxic stress, medical–legal partnerships canmake it easier for families to request a school evaluation or access to special education
services for their child.
To stabilize families’ housing, medical–legal partnerships can help families access housing
benefits, such as subsidies or access to housing mobility programs, that they would
otherwise be denied or unable to claim. To address poor housing quality and protect
tenants from lease agreement violations, medical–legal teams can help families escrow21rent—paying their rent to an escrow account with the local court instead of to thelandlord—when housing quality violates the landlord’s health and safety obligations. Thiscan help motivate a landlord, legally and financially, to undertake required repairs andmaintenance, or adhere to the terms of a lease agreement (Klein et al. 2013; Henize et al.
2015). When families are evicted or threatened with eviction, such teams can provide legal
assistance when those evictions violate tenant rights, they can help families accesstemporary housing, and they can connect families with services that address the mental
and emotional challenges associated with evictions. It is notable that poor, black, single
mothers are most likely to be evicted, among all groups of tenants. In fact, even after
accounting for other factors, being black and having children are, on their own, risk factors
for eviction (Desmond et al. 2013; Desmond 2015, 1).
Finally, medical–legal teams can help identify and address problems with denial or delayof other public benefits (in addition to housing benefits) to which families might be entitled,
including difficulties obtaining medical services and access to Medicaid benefits forchildren.
Two models, described below, offer successful examples of how such partnerships work.
The Peninsula Family Advocacy Program (FAP). At FAP, located in Palo Alto, California,
the staff include an attorney, a project coordinator, and a medical director. FAP partners
with local law firms to offer pro bono services for cases in which legal aid workers do nothave sufficient expertise to help the people involved (Weintraub et al. 2010).
The Health and Legal Partnership (HeLP). HeLP is based at Cincinnati Children’s Hospital.
HeLP’s model is similar to FAP’s; they have one full-time attorney, one half-time attorney,
and one full-time paralegal on site. To enable better identification of problems that need
medical and legal advocacy solutions, residents at the clinic where HeLP is based learn
from legal advocates and community partners about the complex issues that low-income
children face (Klein et al. 2013, 1066–1067).

Conclusion
In any classroom, in any school, in any neighborhood of concentrated disadvantage, it islikely that a disproportionately high number of students suffer from the effects of toxic
stress. It is more demanding for an educator to teach a single child with such symptoms,
and when children suffering from the effects of toxic stress are concentrated in one
classroom, or in one school, the effect is compounded, making it more likely that theachievement of all children in that classroom or school will be depressed.
As health care professionals have started to turn their attention to this important problem,
so should educators and education policymakers. Short of changing the conditions inwhich low-income children live, high-quality support for parents and parents-to-be shouldbe accessible. Programs to offset the effects of toxic stress should be deployed in schoolsof concentrated disadvantage, including programs to effectively support educators.
Policymakers should improve public awareness of this insidious morbidity.

22

About the authors
Leila Morsy has been a research associate with EPI since 2015. She is the co-author ofthree EPI studies, Five Social Disadvantages That Depress Student Performance: Why
Schools Alone Can’t Close Achievement Gaps; Mass Incarceration and Children’s
Outcomes: Criminal Justice Policy Is Education Policy; and Parents’ Non-Standard Work
Schedules Make Adequate Childrearing Difficult: Reforming Labor Market Practices Can
Improve Children’s Cognitive and Behavioral Outcomes. Dr. Morsy’s research interests
include race, socioeconomic inequality, and health inequities and children’s outcomes. Dr.
Morsy can be contacted at leila.morsy@flinders.edu.au.
Richard Rothstein is a Distinguished Fellow of the Economic Policy Institute and a Senior
Fellow, emeritus, at the Thurgood Marshall Institute of the NAACP Legal Defense Fund andof the Haas Institute at the University of California (Berkeley). He is the author of The Colorof Law: A Forgotten History of How Our Government Segregated America. The bookrecovers a forgotten history of how federal, state, and local policy explicitly segregatedmetropolitan areas nationwide, creating racially homogenous neighborhoods in patterns
that violate the Constitution and require remediation. He is also the author of Grading
Education: Getting Accountability Right (2008); Class and Schools: Using Social, Economic
and Educational Reform to Close the Black–White Achievement Gap (2004); and The Way
We Were? Myths and Realities of America’s Student Achievement (1998). Other books
include The Charter School Dust-Up: Examining the Evidence on Enrollment andAchievement (co-authored in 2005); and All Else Equal: Are Public and Private Schools
Different? (co-authored in 2003). He welcomes comments at riroth@epi.org.

Endnotes
1. Toxic stress in children can also cause physiological disruptions that lead to depressed adult
health outcomes later in life. These include hypertension, cardiovascular disease, viral hepatitis,
liver cancer, and chronic obstructive pulmonary disease (Shonkoff 2012). However, adult outcomes
as a result of childhood toxic stress are beyond the scope of this report, and we do not address
them here.
2. Research in this area sometimes describes the frightening or threatening events that can often
result in toxic stress as “adverse childhood experiences” (ACEs). However, for the purpose of thisreport we prefer “frightening or threatening experiences.” While “ACEs” are well understood bymany professionals in the field as a defined set of experiences (e.g., see the ACE module
questionnaire at CDC 2016), the term ACE is not sufficiently descriptive for policymakers. Manyexperiences of a healthy childhood can be “adverse,” whether it is losing a soccer match or having
a disagreement with a sibling or friend. Excessive concern with experiences that are simply“adverse” runs the danger of medicalization of such normal, character-building experiences. Thereis no clean line that can distinguish such normal experiences from those that can lead to toxic
stress. Because children differ in many unobservable ways, what is frightening to some children
may be simply challenging to others, even when the children have similar social and economic
circumstances. So, while a term like “frightening or threatening” runs the risk of underestimating
the possibility of toxic stress response, “adverse childhood experience” runs the risk ofoverestimating it. Inasmuch as concern with toxic stress has only recently become widespread23

among medical professionals, and has barely penetrated educational practice, we hope that thisconcern will grow prudently and gradually and be restricted, in the beginning, to the more clearcut cases.
3. For psychological, physical, and sexual abuse, see Mersky et al. 2009, 81; Coulton et al. 2007,
1134; Saul et al. 2014, 260; and Jimenez et al. 2016, 2. For having a family member incarcerated,
see Morsy and Rothstein 2016; Jimenez et al. 2016, 2; and Slopen et al. 2016, 48, 50: Table 1. For
witnessing domestic violence, see Jimenez et al. 2016, 2; and Slopen et al. 2016, 48, 50: Table 1.
For neglect, see Mersky et al. 2009; Coulton et al. 2007, 1134; Saul et al. 2014, 260; and Jimenez
et al. 2016, 2. For financial hardship, see Slopen et al. 2016, 48, 50: Table 1. For exposure toneighborhood violence, see Slopen et al. 2016, 48, 50: Table 1; and Evans and Kim 2013. For
discrimination, see Slopen et al. 2016, 48, 50: Table 1. For parental divorce or separation, see
Slopen et al. 2016, 48, 50: Table 1. For placement in foster care or kinship care, see Zlotnick, Tam,and Soman 2012. For property wrecked or damaged because of a fire or burglary, see Attar,
Guerra, and Tolan 1994, 395: Table 3. For having a family member become seriously ill or injured,
be hospitalized, or die, see Attar, Guerra, and Tolan 1994, 395: Table 3.
4. Age may also be a factor in whether frightening or threatening events precipitate a toxic stressresponse. This is because, at certain developmental stages of childhood, the brain is moresensitive to changes in external environmental conditions, such as frightening or threatening
experiences. See Immordino-Yang, Darling-Hammond, and Krone 2018.
5. Although more whites than blacks are incarcerated (in absolute numbers, not as a share of theirrespective racial populations), incarcerated whites do not originate from single neighborhoods tothe extent that incarcerated blacks do, in part because white poverty is not as concentrated as
black poverty—whites experiencing poverty tend to be more dispersed throughout the white
population (see “Consequences for Communities” in NRC 2014, beginning on page 283). By age
14, approximately 25 percent of African American children will have had a parent, usually a father,incarcerated for some period of time. The comparable share for white children is 4 percent (seeMorsy and Rothstein 2016).
6. For life transitions, see Attar, Guerra, and Tolan 1994, 395: Table 3. For home crowding, see Evans
2004, 86.
7. These data come from a study with a sample size of over 1,000 children and their families(Jimenez et al. 2016). Another study with a larger sample (close to 85,000 children) finds similar
results. It concludes that black children were more likely to have been exposed to frightening or
threatening childhood experiences than white children. Black children were 27 percent more likely
to have been exposed to one frightening or threatening experience than white children, and were
51 percent more likely to have been exposed to two or more frightening or threatening
experiences. They were one-third less likely than white children to have been exposed to no suchchildhood experiences (Slopen et al. 2016, Table 1, on page 50). In addition to the list offrightening or threatening childhood experiences included in the Jimenez et al. study (physicalabuse, sexual abuse, psychological abuse, neglect, living with someone with substance abuseproblems or mental illness, seeing a caregiver treated violently, or having a parent incarcerated),
the Slopen et al. study also includes children’s exposure to neighborhood violence, racial
discrimination, financial hardship, and parental divorce or separation.
8. In 2005, the last year for which study data were collected, 12 percent of white families had
incomes below $20,000, compared with 29 percent of black families (U.S. Census Bureau CPSASEC 2006). See also Wilson and Rogers 2016.
9. The study data do not allow us to determine whether the poorer outcomes resulted from24

exposure to frightening or threatening experiences, or from other conditions connected with low
socioeconomic status. However, in this study, comparisons were made across children who weresimilar in age, gender, race, maternal education, parent relationship status, and householdincome—so there is a suggestion of causality. Children who had been exposed to three or morefrightening or threatening experiences were compared with children who had had no frighteningor threatening life experiences (Jimenez et al. 2016, 5).
10. See note 8, above.
11. Related to attention problems, another study found that children who had been exposed to three,or four or more, frightening or threatening experiences, respectively, have 1.8 and 2.7 times theodds of being diagnosed with attention deficit hyperactivity disorder (ADHD) by age 9 thanchildren who had been exposed to no such experiences. Children in this study were similar inmother’s race, education, marital status, number of children, prenatal substance use, age at her
child’s birth, and whether the focal child was the mother’s first birth. The children were of the samegender and of similar birth weight. The study also controlled for family income, the number ofother children and adults living in the home, and whether the focal child’s grandmother was livingin the household. Children who had been exposed to three frightening or threatening experiences
and children who had had four or more such experiences were separately compared with children
who had had no such experiences (Hunt, Slack, and Berger 2017, 398, and Table 2 on pages
397–398).
12. For ear infections, acute respiratory infections, eczema, and viral infections, see Karlén et al.
2015, e1454: Table 2. Children in this study were Swedish, and of similar age (10 years) and birthweight. They had been exposed to three or more frightening or threatening experiences. They
were compared with similar children who had no frightening or threatening experiences (Karlén etal. 2015, e1454).
13. For obesity, see Burke et al. 2011, 411. Children in this study were under 21 years old and lowincome, and similar in age, gender, and ethnicity. They had been exposed to four or morefrightening or threatening experiences. They were compared with children of the same genderand similar in age and ethnicity who had had no frightening or threatening experiences. The
measure of obesity was taken from a two-year retrospective review of children’s medical charts(Burke et al. 2011, 411).
14. For teen pregnancy, see Hillis et al. 2004, 323: Table 4. This study compared girls who had been
exposed to three or more frightening or threatening experiences with girls of the same race, age,and education level who had had no frightening or threatening experiences. Pregnancies wereconsidered “teenage” if they occurred between the ages of 11 and 19 (Hillis et al. 2004, 323).
15. See Bahreinian et al. 2013, 146. Researchers measured stress-related physiological dysregulation,
or “weathering,” using a set of biomarkers: fasting glucose, total cholesterol, high-density
lipoprotein cholesterol, dehydroepiandrosterone sulfate (a naturally occurring steroid), cortisol,
systolic and diastolic blood pressure, and waist-to-hip ratio. Cumulatively, these biomarkers
indicate a person’s lifelong level of exposure to stress-inducing conditions, and the aggregate
measure is called the “allostatic load.” Generally, people with higher allostatic loads haveexperienced more stressful events and conditions throughout their lives than those with lower
allostatic loads. The study compared boys who had high allostatic scores (scoring in the highest
quartile for three or more stress-related biomarkers) with boys who had low allostatic scores(scoring in the highest quartile for two or fewer stress-related biomarkers). The study reports thatafter accounting for the usual predictors of asthma—including boys’ age and ethnicity, whether
boys are allergically hypersensitive or allergic, and whether their parents have or have had
asthma—boys with high biomarkers of stress are four times as likely to have asthma as their

25

counterparts with low biomarkers of stress (Bahreinian et al. 2013, 144).
16. There are neighborhoods of concentrated disadvantage that are primarily Hispanic. However, on
average, Hispanic Americans have greater social mobility than African Americans. Hispanic
Americans suffer from contemporary discrimination, and yet the consequences of historic
discrimination against African Americans—including slavery and legally ratified race-based
segregation, compounded with contemporary discrimination—has resulted in extremely low social
mobility for African Americans, and high levels of neighborhood deterioration and poverty
concentration.

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