bluuebunny/crossref_metadata_2025_split huggingface dataset:
Predictive Model for Serious Bacterial Infections Among Infants Younger Than 3 Months of Age
Authors: Bachur Richard G. , Harper Marvin B. 
Published: August 2004

Objective.To develop a data-derived model for predicting serious bacterial infection (SBI) among febrile infants &lt;3 months old.Methods.All infants ≤90 days old with a temperature ≥38.0°C seen in an urban emergency department (ED) were retrospectively identified. SBI was defined as a positive culture of urine, blood, or cerebrospinal fluid. Tree-structured analysis via recursive partitioning was used to develop the model. SBI or No-SBI was the dichotomous outcome variable, and age, temperature, urinalysis (UA), white blood cell (WBC) count, absolute neutrophil count, and cerebrospinal fluid WBC were entered as potential predictors. The model was tested by V-fold cross-validation.Results.Of 5279 febrile infants studied, SBI was diagnosed in 373 patients (7%): 316 urinary tract infections (UTIs), 17 meningitis, and 59 bacteremia (8 with meningitis, 11 with UTIs). The model sequentially used 4 clinical parameters to define high-risk patients: positive UA, WBC count ≥20 000/mm3 or ≤4100/mm3, temperature ≥39.6°C, and age &lt;13 days. The sensitivity of the model for SBI is 82% (95% confidence interval [CI]: 78%–86%) and the negative predictive value is 98.3% (95% CI: 97.8%–98.7%). The negative predictive value for bacteremia or meningitis is 99.6% (95% CI: 99.4%–99.8%). The relative risk between high- and low-risk groups is 12.1 (95% CI: 9.3–15.6). Sixty-six SBI patients (18%) were misclassified into the lower risk group: 51 UTIs, 14 with bacteremia, and 1 with meningitis.Conclusions.Decision-tree analysis using common clinical variables can reasonably predict febrile infants at high-risk for SBI. Sequential use of UA, WBC count, temperature, and age can identify infants who are at high risk of SBI with a relative risk of 12.1 compared with lower-risk infants.
Economic Evaluation of a 2-Dose Hepatitis B Vaccination Regimen for Adolescents
Authors: Levaux Hugh P. , Schonfeld Warren H. , Pellissier James M. , Cassidy William M. , Sheriff Sara K. , Fitzsimon Catherine 
Published: August 2004

Objective.
To investigate the economic implications of a 2-dose hepatitis B virus vaccination regimen compared with the current 3-dose vaccination regimen for adolescents in 3 settings: public schools, public health clinics, and private sector settings in the United States.

Methods.
To measure resource utilization and costs associated with the administration of the 3-dose regimen and to assess vaccination compliance rates with this regimen, primary data were collected with the use of questionnaires tailored for each setting. Conservative modeling assumptions were used to derive 2-dose compliance rates from 3-dose compliance data. The results were incorporated into a decision analytic model, which was used to examine short-term and lifetime scenarios for an adolescent cohort receiving the 2-dose versus the 3-dose regimen. In the short-term analysis, the vaccination program costs were compared for the 2 regimens. In the lifetime analysis, the model also incorporated long-term disease costs for those individuals who contract hepatitis B.

Results.
Predicted increases in compliance with a 2-dose vaccination regimen contributed to a higher probability of seroprotection in each setting. In the lifetime analysis, this positive impact of improved compliance resulted in a lower infection rate and greater cost-effectiveness for the 2-dose regimen in all settings, including private sector settings, where it cost an average of only $964 per year of life gained, and in public schools, costing an average of $1246 per year of life gained. In public health clinics, the 2-dose regimen had both lower expected lifetime costs and better clinical outcomes than the 3-dose regimen. In the short-term analysis, costs were higher for the 2-dose regimen, reflecting higher total vaccine acquisition costs without the long-term offset of cost savings from reduced infection. Sensitivity analyses identified cost per dose of vaccine and the probability of completing the regimens as the most sensitive model variables.

Conclusions.
Improved compliance with a 2-dose regimen would contribute to a higher probability of adolescents' achieving seroprotection. When the long-term consequences of hepatitis B virus infection are included, the 2-dose regimen would be cost-effective compared with the 3-dose regimen in all settings and cost saving in public health clinic settings.
Association Between Serum Macrophage Colony-Stimulating Factor Levels and Monocyte and Thrombocyte Counts in Healthy, Hypoxic, and Septic Term Neonates
Authors: Ören Hale , Duman Nuray , MD Hakan Abacıog ¯ lu, , Özkan Hasan , MD Gülersu I˙rken, 
Published: August 2004

Objective.Macrophage colony-stimulating factor (M-CSF) is a hematopoietic growth factor that mainly stimulates the growth, differentiation, and proliferation of cells of the monocyte-macrophage lineage. There are only limited numbers of studies about M-CSF levels in neonates, but high levels of serum M-CSF have been reported in septic and some thrombocytopenic adult patients. In this study, we investigated the serum M-CSF levels in healthy, septic, and hypoxic term neonates on the first day of life and examined the relationship of serum M-CSF levels and circulating monocyte and thrombocyte counts in these newborn infants.Study Design.Three groups were defined in this prospective study: group 1, healthy neonates with no risk factors (n = 40); group 2, neonates who had severe hypoxia (n = 20); and group 3, neonates who fulfilled the criteria for early-onset sepsis (n = 18). Blood samples were collected for complete blood cell count and serum M-CSF levels by peripheral venipuncture from each infant in the first 24 hours after birth before any medical therapy.Results.The gestational ages and birth weights did not differ significantly between the groups. Serum M-CSF levels of the septic neonates were significantly higher than of both healthy and hypoxic neonates, but did not differ significantly between the healthy and hypoxic neonates. There was no significant correlation between serum M-CSF levels and circulating monocyte counts, but there was a significant inverse correlation between serum M-CSF levels and thrombocyte counts. When this correlation was analyzed according to groups, we determined that this inverse correlation between M-CSF levels and thrombocyte counts was especially significant in the septic neonate group, but not significant in the healthy and hypoxic neonate groups.Conclusions.Serum M-CSF levels are significantly higher in neonates with sepsis. High serum M-CSF levels may have a possible role in the pathogenesis of thrombocytopenia in neonates with sepsis.
Intention to Return for Papanicolaou Smears in Adolescent Girls and Young Women
Authors: Kahn Jessica A. , Goodman Elizabeth , Slap Gail B. , Huang Bin , Emans S. Jean 
Published: August 2004

Objective.Sexually active adolescent girls have high rates of abnormal cervical cytology. However, little is known about factors that influence intention to return for Papanicolaou screening or follow-up. The aim of this study was to determine whether a theory-based model that assessed knowledge, attitudes, and behaviors predicted intention to return.Methods.The study design consisted of a self-administered, cross-sectional survey that assessed knowledge, beliefs, perceived control over follow-up, perceived risk, cues for Papanicolaou smears, impulsivity, risk behaviors, and past compliance with Papanicolaou smear follow-up. Participants were recruited from a hospital-based adolescent clinic that provides primary and subspecialty care, and the study sample consisted of all sexually active girls and young women who were aged 12 to 24 years and had had previous Papanicolaou smears. The main outcome measure was intention to return for Papanicolaou smear screening or follow-up.Results.The enrollment rate was 92% (N = 490), mean age was 18.2 years, 50% were black, and 22% were Hispanic. Eighty-two percent of participants intended to return. Variables that were independently associated with intention to return included positive beliefs about follow-up (odds ratio [OR]: 1.07; 95% confidence interval [CI]: 1.02–1.11), perception that important others believe that the participant should obtain a Papanicolaou smear (OR: 1.93; 95% CI: 1.38–2.74), perceived control over returning (OR: 1.24; 95% CI: 1.06–1.46), and having received cues to obtain a Papanicolaou smear (OR: 1.31; 95% CI: 1.08–1.60).Conclusions.Analysis of this novel theoretical framework demonstrated that knowledge and previous behaviors were not associated with intention to return for Papanicolaou smear screening and follow-up in this population of young women. However, modifiable attitudinal components, including personal beliefs, perception of others' beliefs, and cues to obtaining Papanicolaou smears, were associated with intention to return.
Earlier Onset of Puberty in Girls: Relation to Increased Body Mass Index and Race
Authors: Kaplowitz Paul B. , Slora Eric J. , Wasserman Richard C. , Pedlow Steven E. , Herman-Giddens Marcia E. 
Published: August 2004

Objective.
A recent study conducted by the Pediatric Research in Office Settings network provided evidence that girls in the United States, especially black girls, are starting puberty at a younger age than earlier studies had found, but the reasons for this are not known. Because nutritional status is known to affect timing of puberty and there is a clear trend for increasing obesity in US children during the past 25 years, it was hypothesized that the earlier onset of puberty could be attributable to the increasing prevalence of obesity in young girls. Therefore, the objective of this study was to reexamine the Pediatric Research in Office Settings puberty data by comparing the age-normalized body mass index (BMI-ZS; a crude estimate of fatness) of girls who had breast or pubic hair development versus those who were still prepubertal, looking at the effects of age and race.

Results.
For white girls, the BMI-ZS were markedly higher in pubertal versus prepubertal 6- to 9-year-olds; for black girls, a smaller difference was seen, which was significant only for 9-year-olds. Higher BMI-ZS also were found in girls who had pubic hair but no breast development versus girls who had neither pubic hair nor breast development. A multivariate analysis confirms that obesity (as measured by BMI) is significantly associated with early puberty in white girls and is associated with early puberty in black girls as well, but to a lesser extent.

Conclusions.
The results are consistent with obesity's being an important contributing factor to the earlier onset of puberty in girls. Factors other than obesity, however, perhaps genetic and/or environmental ones, are needed to explain the higher prevalence of early puberty in black versus white girls.
Growth and Development in Term Infants Fed Long-Chain Polyunsaturated Fatty Acids: A Double-Masked, Randomized, Parallel, Prospective, Multivariate Study
Authors: Auestad Nancy , Halter Robin , Hall Robert T. , Blatter Mark , Bogle Margaret L. , Burks Wesley , Erickson Julie R. , Fitzgerald Kathleen M. , Dobson Velma , Innis Sheila M. , Singer Lynn T. , Montalto Michael B. , Jacobs Joan R. , Qiu Wenzi , Bornstein Marc H. 
Published: August 2004

Objective.
To evaluate the effects of dietary intake of the long-chain polyunsaturated fatty acids, arachidonic acid (AA), and docosahexaenoic acid (DHA) on multiple indices of infant growth and development.

Design.
A double-masked, randomized, parallel trial was conducted with term infants fed formulas with or without AA+DHA for 1 year (N = 239). Reference groups of breastfed infants (N = 165) weaned to formulas with and without AA+DHA were also studied. Infants in the formula groups were randomized at ≤9 days of age to a control formula with no AA or DHA (n = 77) or 1 of 2 otherwise identical formulas containing AA+DHA (AA, 0.46% and DHA, 0.14% of total fatty acids) from either egg-derived triglyceride (egg-DTG [n=80]) or fish oil and fungal oil (fish/fungal [n = 82]) at levels similar to the average in breast milk samples as measured in the reference group. All formulas contained 50% of energy from fat with the essential dietary fatty acids, linoleic acid (20% fatty acids) and α-linolenic acid (2% fatty acids). The main study outcomes were AA and DHA levels in plasma and red blood cells, and multiple measures of infant development at multiple ages from birth to 14 months: growth, visual acuity, information processing, general development, language, and temperament.

Results.
AA and DHA levels in plasma and red cells were higher in AA+DHA-supplemented groups than in the control formula group and comparable to those in reference groups. No developmental test results distinguished these groups. Expected differences in family demographics associated with breastfeeding were found, but no advantages to breastfeeding on any of the developmental outcome demonstrated.

Conclusions.
These findings do not support adding AA+DHA to formulas containing 10% energy as linoleic acid and 1% energy as α-linolenic acid to enhance growth, visual acuity, information processing, general development, language, or temperament in healthy, term infants during the first 14 months after birth.infant development, breast feeding, infant formula, long-chain polyunsaturated fatty acids, docosahexaenoic acid.
Physical Growth and Current Health Status of Infants Who Were of Extremely Low Birth Weight and Controls at Adolescence
Authors: Saigal Saroj , Stoskopf Barbara L. , Streiner David L. , Burrows Elizabeth 
Published: August 2004

Objectives.
To compare the physical growth, current health status, and utilization of health care resources by extremely low birth weight (ELBW) and control (C) adolescents and to look at changes over time.

Methods.
A longitudinal regional cohort study was conducted. Growth measures were converted to z scores on the National Center for Health Statistics growth curves. Information regarding current health status/health care utilization was obtained by parental interviews.

Results.
A total of 154 (91%) of 169 ELBW survivors between 12 and 16 years and 125 (86%) of 145 controls participated. Neurosensory impairments were present in 28% of ELBW survivors and 2% of control participants. Mean z scores for both height and weight were below 0 for ELBW survivors (weight: −0.35; height: −0.55) compared with control participants (weight: 0.40; height: 0.28). However, among ELBW survivors, significant catch-up growth occurred in both parameters between age 8 and adolescence but remained stable among control participants. ELBW survivors had a higher prevalence of visual problems (57% vs 21%), seizures (7% vs 1%), developmental delay (26% vs 1%), learning disabilities (34% vs 10%), and hyperactivity (9% vs 2%) and used more specialists and community resources than did control participants.

Conclusions.
Although physical growth continues to be compromised and substantial morbidity remains among ELBW survivors at adolescence, there seems to be some catch-up growth, a reduction in the prevalence of acute health problems, and a decrease in the utilization of medical resources.
Evaluation of the Triangular Cord Sign in the Diagnosis of Biliary Atresia
Authors: Kotb Magd A. , Kotb Ahmed , Sheba Maha F. , Koofy Nehal M. El , El-Karaksy Hanaa M. , Abdel-Kahlik Mohamed K. , Abdalla Ahmed , El-Regal Mohammed Ez , Warda Rady , Mostafa Hosam , Karjoo Manoochehr , A-Kader Hassan H. 
Published: August 2004

Background.
Infantile cholestasis continues to represent a diagnostic challenge. It is very important to diagnose surgically correctable disorders, such as biliary atresia, in a timely manner to prevent progressive damage to the liver. It has been recently suggested that the triangular cord (TC) sign is a simple and useful tool in the diagnosis of biliary atresia.

Methods.
We prospectively studied 65 infants presenting with conjugated hyperbilirubinemia (age range: 32–161 days). All patients underwent ultrasonographic examination with a 7.0-MHz transducer (Acuson, Mountain View, CA). The TC was defined as a triangular, or tubular, echogenic density seen immediately cranial to the portal vein bifurcation.

Results.
The TC sign was identified in 25 infants, and all of them had histologic features suggestive of biliary atresia; the diagnosis was confirmed at surgery by gross morphology of hepatobiliary system, and liver biopsy, with or without intraoperative cholangiogram. Among the 40 patients who did not have the TC sign, 6 had paucity of the intrahepatic bile ducts. Three had alph-1-antitrypsin deficiency, and 31 had neonatal hepatitis. None of the 40 patients who did not have the TC sign developed acholic stools. Seven patients with biliary atresia were followed by ultrasonographic examination for 6 months after the Kasai procedure. The TC sign disappeared in all patients after the surgery; however, the TC sign reappeared in 3 patients who developed progressive cholestasis after the procedure.

Conclusion.
The TC sign is a simple, timesaving, and reliable diagnostic tool in the evaluation of infants with infantile cholestasis. The TC sign may also prove to be helpful in following patients after hepatoportoenterostomy. We suggest a new diagnostic strategy for patients suspected to have biliary atresia. When the TC sign is visualized, the patient should undergo intraoperative cholangiogram to confirm the diagnosis of biliary atresia, reserving percutaneous liver biopsy for those patients in whom the TC sign could not be detected.
Creatine Use Among Young Athletes
Authors: Metzl Jordan D. , Small Eric , Levine Steven R. , Gershel Jeffrey C. 
Published: August 2004

Objective.
Creatine is a nutritional supplement that is purported to be a safe ergogenic aid in adults. Although as many as 28% of collegiate athletes admit taking creatine, there is little information about creatine use or potential health risk in children and adolescents. Although the use of creatine is not recommended in people less than 18 years of age, numerous anecdotal reports indicate widespread use in young athletes. The purpose of this study was to determine the frequency, risk factors, and demographics of creatine use among middle and high school student athletes.

Methods.
Before their annual sports preparticipation physical examinations, middle and high school athletes aged 10 to 18 in Westchester County, a suburb north of New York City, were surveyed in a confidential manner. Information was collected regarding school grade, gender, specific sport participation, and creatine use.

Results.
Overall, 62 of 1103 participants (5.6%) admitted taking creatine. Creatine use was reported in every grade, from 6 to 12. Forty-four percent of grade 12 athletes surveyed reported using creatine. Creatine use was significantly more common (P &lt; .001) among boys (53/604, 8.8%) than girls (9/492, 1.8%). Although creatine was taken by participants in every sport, use was significantly more common among football players, wrestlers, hockey players, gymnasts, and lacrosse players (P &lt; .001 for all). The most common reasons cited for taking creatine were enhanced performance (74.2% of users) and improved appearance (61.3%), and the most common reason cited for not taking creatine was safety (45.7% of nonusers).

Conclusions.
Despite current recommendations against use in adolescents less than 18 years old, creatine is being used by middle and high school athletes at all grade levels. The prevalence in grades 11 and 12 approaches levels reported among collegiate athletes. Until the safety of creatine can be established in adolescents, the use of this product should be discouraged.
Are Neonatal Intensive Care Resources Located According to Need? Regional Variation in Neonatologists, Beds, and Low Birth Weight Newborns
Authors: Goodman David C. , Fisher Elliott S. , Little George A. , Stukel Thérèse A. , Chang Chiang-hua 
Published: August 2004

Objective.Despite marked growth in neonatal intensive care during the past 30 years, it is not known if neonatologists and beds are preferentially located in regions with greater newborn risk. This study reports the relationship between regional measures of intensive care capacity and low birth weight infants using newly developed market-based regions of neonatal intensive care.Design.Cross-sectional small-area analysis of 246 neonatal intensive care regions (NICRs).Data Sources.1996 American Medical Association and American Osteopathic Association masterfiles data of clinically active neonatologists; 1999 American Academy of Pediatrics Section on Perinatal Pediatrics survey of directors of neonatal intensive care units in the United States with 100% response rate; 1995 linked birth/death data.Results.The number of total births per neonatologist across NICRs ranged from 390 to 8197 (median: 1722) and the number of total births per intensive care bed ranged from 72 to 1319 (median: 317). The associations between capacity measures and low birth weight rates across NICRs were statistically significant but negligible (R2: 0.04 for neonatologists; 0.05 for beds). NICRs in the quintile with the greatest neonatologist capacity (average of only 863 births per neonatologist) had very low birth weight (VLBW) rates of 1.5% while those in the quintile of lowest neonatologist capacity (average of 3718 births per neonatologist) had VLBW rates of 1.3%; a similar lack of meaningful difference in VLBW rates was noted across quintiles of intensive care bed capacity. Including midlevel providers and intermediate care beds to the analyses did not alter the findings.Conclusions.Neonatal intensive care capacity is not preferentially located in regions with greater newborn need as measured by low birth weight rates. Whether greater capacity affords benefits to the newborns remains unknown.
Predictors of Hazardous Child Seating Behavior in Fatal Motor Vehicle Crashes: 1990 to 1998
Authors: Wittenberg Eve , Goldie Sue J. , Graham John D. 
Published: August 2004

Objective.
Motor vehicle crashes are the leading cause of death in children ages 5 to 14. Children seated in the front seats of vehicles are at increased risk of death and injury in crashes, particularly in vehicles with passenger-side air bags. This study identifies factors associated with the seating of children in the front seats of vehicles involved in fatal crashes between 1990 and 1998.

Methods.
Using 1990 to 1998 data from the Fatal Analysis Reporting System, a US census of motor vehicle crashes involving a fatality, multivariable logistic regression was used to model the association between child seating behavior and vehicle, driver, and occupant characteristics.

Results.
The proportion of vehicles carrying children in the front declined from 42% to 31% over the 9-year period. Controlling for driver and vehicle characteristics, the risk of front-seating declined between 1990 and 1998, and this risk was smaller in vehicles carrying only younger children (≤6 years) than in those carrying older children. In the 3 years after the introduction of dual air bags into a significant proportion of the passenger fleet in late 1995, dual air bags were associated with fewer children being seated in the front seat. By the end of 1998, traveling in a vehicle with dual air bags and only children age 6 or younger was associated with a 95% lower chance of a child being seated in the front (odds ratio = 0.05; 95% confidence interval: 0.04–0.08). An important factor in safer seating position was the presence of multiple passengers, especially an older one, and children were at higher risk of front-seating when they traveled alone with the driver.

Conclusions.
The 1990s saw a decline in front-seating of children in vehicles involved in fatal crashes among all types of vehicles and drivers. Although this trend is encouraging, children ages 6 to 12 and children traveling alone with the driver remain at higher risk of being seated in the front. These traveling situations should be targeted for behavioral safety interventions to improve child motor vehicle safety.