DOI: 10.3886/icpsr36629.v2
title: Northwestern Juvenile Project (Cook County, Illinois): Follow-up 2, 1999 - 2005
title: Version 2

description: This study contains data from the second follow-up interview of the Northwestern Juvenile Project (NJP), a longitudinal assessment of alcohol, drug, or mental service treatment needs of juvenile detainees. This second follow-up occurred approximately 3.5 years after the baseline interview and focused on the development and persistence of psychiatric disorders, related predictive variables, patterns of drug use, and other risky behaviors.
The project's aims included studying (1) development and persistence of alcohol, drug, and mental disorders and (2) pathways and patterns of risky behaviors. Researchers studied changes in disorders over time (including onset, remission, and recurrence), comorbidity, associated functional impairments, and the risk and protective factors related to these disorders and impairments. The NJP addressed the patterns and sequences of the development of drug use and related variables, focusing on gender differences, racial/ethnic differences, the antecedents of these risky behaviors (risk and protective factors), and how these behaviors are interrelated.
The original sample included 1829 randomly selected youth, 1172 males and 657 females, then 10 to 18 years old, enrolled in the study as they entered the Cook County Juvenile Temporary Detention Center from 1995 to 1998. Among the sample were 1,005 African Americans, 524 Hispanics, 296 non-Hispanic white respondents. A random subsample of 997 of the baseline participants were chosen for second follow-up interviews. Researchers tracked participants from the time they left detention and re-interviewed them regardless of where they were living when their follow-up interview was due: in the community, correctional settings, or by telephone if they lived farther than two hours from Chicago.
The study was funded by OJJDP, several institutes at the National Institutes of Health, and other federal agencies and private foundations. The National Institutes of Health funded an additional component on HIV/AIDS risk behaviors.
description: The project's aims included studying (1) development and persistence of alcohol, drug, and mental disorders and (2) pathways and patterns of risky behaviors. Researchers studied changes in disorders over time (including onset, remission, and recurrence), comorbidity, associated functional impairments, and the risk and protective factors related to these disorders and impairments. The NJP addressed the patterns and sequences of the development of drug use and related variables, focusing on gender differences, racial/ethnic differences, the antecedents of these risky behaviors (risk and protective factors), and how these behaviors are interrelated.
Data from the baseline interview were deposited with the National Addiction and HIV Data Archive Program at the Inter-University Consortium for Political and Social Research (ICPSR). Data from the first follow-up (conducted approximately three years after the baseline) were deposited with ICPSR's National Archive of Criminal Justice Data.
description: A random subsample of participants was scheduled for a second follow-up interview approximately 3.5 years after their baseline interview (Follow-up 2). Participants were tracked until they were found for an interview, withdrew, or were known to have died. Some participants who were difficult to locate received their follow-up interviews substantially later than the planned interview dates.
Follow-up interviews were conducted face-to-face wherever the participant was living--in the community or in any correctional facility in Illinois--at the time their interview was due. However, community interviews were conducted by telephone if the participant lived more than 2 hours away. Diagnostic modules were administered via pencil and paper interviewing (PAPI) or computer assisted personal interviewing (CAPI). Non-diagnostic modules were administered via PAPI.
description: The Northwestern Juvenile Project Follow-Up 2 contains 24 parts consisting of the following variables:

<strong>Main</strong> (da36629-0001; n=997; 23 variables) includes administrative information (e.g., interview status, location, date) and age at interview.
<strong>Comments</strong> (da36629-0002; n=939; 64 variables) includes interviewer observations of how participants managed the interview, including whether participants had any difficulties with particular measures, whether participants seemed to be truthful, and whether the participant exhibited any psychotic symptoms. Interviewers filled out this observational measure following the interview.
The <strong>Child Adolescent Functional Assessment Scale-Youth and Young Adult</strong> (CAFAS; da36629-0003; n=940; 37 variables) is a multidimensional measurement of functional impairment that includes scales of role performance, behavior toward others, mood, self-harmful behavior, substance use, and thinking.
The <strong>Child and Adolescent Services Assessment-Modified</strong> (CASA) probes various dimensions of mental health and substance abuse service use, including reason for services, type of treatment, frequency and duration of the service, referral sources, pathways to services, and attitudes and barriers to treatment. CASA is broken into five parts. CASA_A (da36629-0004; n=937; 364 variables) describes school services. CASA_B (da36629-0005; n=52; 56 variables) describes non-school services. CASA_C (da36629-0006; n=37; 61 variables) describes services provided in addition to mental health services from CASA A and CASA B. CASA_D (da36629-0007; n=104; 133 variables) describes the referral source for mental health services. CASA_E (da36629-0008; n=171; 127 variables) describes subject's attitudes and barriers to treatment.
The <strong>Child and Family Assessment</strong> (CFA; da36629-0009; n=940; 741 variables) includes variables describing residence status, family structure, life events including pregnancy, experiences of homelessness, participation in school and community activities, family functioning assessment (parenting practices, family cohesion and conflict, and family attitudes and beliefs), significant losses, community functioning, quality of life and life events, and future orientation. CFA_GRID (da36629-0010; n=3,491; 43 variables) includes variables related to family structure and financial support.
The <strong>Children's Global Assessment Scale</strong> (CGAS; da36629-0011; n=938; 4 variables) summarizes the interviewer's impression of the lowest level of the participant's functioning at home, in school and/or work, and in other social environments.
The <strong>Diagnostic Interview Schedule</strong> (DIS) is a structured interview that assesses psychiatric disorders based on the DSM-IV. DIS_DX (da36629-0012; n=941; 617 variables) includes diagnoses of substance abuse, dependence, and withdrawal. DIS_ITEMS (da36629-0013; n=941; 606 variables) includes items from the interview questionnaire on which DIS_DX diagnoses were based, including household characteristics, health history, substance use, and symptoms related to substance dependence and withdrawal. 
The <strong>Diagnostic Interview Schedule for Children</strong> (DISC) is a structured interview of children that assesses psychiatric disorders based on DSM-IV criteria. DISC_DX (da36629-0014; n=938; 255 variables) includes diagnoses of psychiatric disorders, including mania, hypomania, major depression disorder, post-traumatic stress disorder, and schizophrenia. DISC_ITEMS (da36629-0015; n=938; 701 variables) includes items from the interview questionnaire on which DISC_DX diagnoses were based, including household characteristics, education history, traumatic experiences, and a wide range of symptoms.
The <strong>Risk Behavior Assessment Profile</strong> (RBAP) has 6 parts. RBAP (da36629-0016; n=940; 1216 variables) discusses a wide range of behaviors, including drug use, drug sales, sexual activity, knowledge about HIV/AIDS, illegal activities, gun ownership, and gang membership. RBAP_DRUG (da36629-0017; n=983; 104 variables) identifies motives for drug use and sources for acquiring drugs. RBAP_GRID (da36629-0018; n=943; 20 variables) includes follow-up questions related to drug use, HIV, gun ownership, and gang membership. RBAP_IDU (da36629-0019; n=3; 72 variables) contains variables related to injected drug use and quitting drug use. RBAP_INTERVENTION (da36629-0020; n=759; 61 variables) discusses participation in and behavior changes related to HIV/AIDS services. RBAP_SEX (da36629-0021; n=765; 150 variables) discusses sexual behavior and condom use.
The <strong>Kaufman Short Neurological Assessment Procedure</strong> (KSNAP; da36629-0022; n=821; 79 variables) includes results and scores for four subtests of cognitive functioning (gestalt closure, number recall, four-letter words, and recall/closure) as well as composite assessment score.
The <strong>Wide Range Achievement Test</strong> (WRAT; da36629-0023; n=853; 17 variables) includes test results and achievement scores measuring math and reading ability.
<strong>Incarceration</strong> (da36629-0024; n=942, 10 variables) comes from a combination of correctional records and self-report, and includes information on the number of days incarcerated prior to the interview.
description: Follow-up weights are sampling weights augmented with adjustments for nonresponse (e.g., withdrew, died) at the follow-up. Sampling weights and normalized sampling weights are also provided in dataset da36629-0001.
description: Response Rates: By 6 years after their baseline interview, 918 participants had received a follow-up 2 interview. Twenty-four participants received follow-up 2 interviews more than 6 years after their baseline interview. Other reasons for nonresponse at follow-up 2 were: died before the 6-year cut-off (n=11); withdrew from the study (n=13); and could not be located (n=31).
description: Presence of Common Scales: Child Adolescent Functional Assessment Scale-Youth and Young Adult (CAFAS)
Child and Adolescent Services Assessment-Modified (CASA)
Child and Family Assessment (CFA)
Children's Global Assessment Scale (CGAS)
Diagnostic Interview Schedule (DIS)
Diagnostic Interview Schedule for Children (DISC)
Risk Behavior Assessment Profile (RBAP)
Kaufman Short Neurological Assessment Procedure (KSNAP)
Wide Range Achievement Test (WRAT)
description: Males and females aged 10 to 18 years were randomly sampled at intake into the Cook County Juvenile Temporary Detention Center (CCJTDC) from November 1995 through June 1998. The sample was stratified by gender, race/ethnicity (African American, non-Hispanic White, Hispanic, other), age (males only, aged 10 to 13 years or 14 years and older), and legal status (males only, processed as a juvenile or as an adult). There were a total of 13 strata:


black females
non-Hispanic white females
Hispanic females
black males, 10-13 years old
non-Hispanic white males, 10-13 years old
Hispanic males, 10-13 years old
older black males, processed as adults
older non-Hispanic white males, processed as adults
older Hispanic males, processed as adults
older black males, processed as juveniles
older non-Hispanic white males, processed as juveniles
older Hispanic males, processed as juveniles
other race/ethnicity


Detainees were eligible to be sampled regardless of their psychiatric morbidity, state of drug or alcohol intoxication, or fitness to stand trial. Within each stratum, the project used a random-numbers table to select names from Cook County Juvenile Temporary Detention Center's intake log. The final sampling fractions ranged from 0.018 to 0.689.
Researchers conducted the first follow-up approximately three years after the baseline with the full sample. The second follow-up was conducted approximately 3.5 years after the baseline with a random subsample.
description: Datasets: 
DS0: Study-Level Files
DS1: MAIN
DS2: COMMENTS
DS3: CAFAS
DS4: CASA A
DS5: CASA B
DS6: CASA C
DS7: CASA D
DS8: CASA E
DS9: CFA
DS10: CFA GRID
DS11: CGAS
DS12: DIS DX
DS13: DIS ITEMS
DS14: DISC DX
DS15: DISC ITEMS
DS16: RBAP
DS17: RBAP DRUG
DS18: RBAP GRID
DS19: RBAP IDU
DS20: RBAP INTERVENTION
DS21: RBAP SEX
DS22: KSNAP
DS23: WRAT
DS24: INCARCERATION
description: Male and female juvenile detainees, ages 10 to 18, in the Cook County (IL) Juvenile Temporary Detention Center (CCJTDC) between November 1995 and June 1998. All detainees younger than 17 years are held at CCJTDC, including youths processed as adults (automatic transfers to adult court). Youths may be detained in the CCJTDC until they are 21 years of age if they are being prosecuted for an arrest that occurred when they were younger than 17 years. Smallest Geographic Unit: Cook County, Illinois
description: computer-assisted personal interview (CAPI); face-to-face interview; mixed mode; paper and pencil interview (PAPI); telephone interviewIncluded in this release are two zip files containing multiple text files to accompany the DIS DX (da36629-00012) and DISC DX (da36629-0014) data files. The text files provide a detailed description of criteria used for diagnosis and SAS code used for the Principal Investigator to calculate analysis variables.