SELF‐REPORTED DELINQUENCY AND A COMBINED DELINQUENCY SERIOUSNESS SCALE BASED ON BOYS, MOTHERS, AND TEACHERS: CONCURRENT AND PREDICTIVE VALIDITY FOR AFRICAN‐AMERICANS AND CAUCASIANS*

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Abstract
The Pittsburgh Youth Study is a prospective longitudinal survey of three samples of Pittsburgh boys (each containing about 500 boys) initially studied in first, fourth, and seventh grades. The first two data collection waves yielded self‐reported delinquency and combined delinquency seriousness scores (the combined scores based on information from boy, mother, and teacher) for the middle sample (up to an average age of 10.7 years) and oldest sample (up to an average age of 13.9 years). These scores were compared with records of petitions to the Allegheny County Juvenile Court for delinquency offenses before and up to six years after the assessments. The area under the ROC curve was used as a measure of validity. Concurrent validity was higher than predictive validity. The combined scale had similar concurrent validity but greater predictive validity than the self‐report scale, and the combined scale also identified a greater number of boys as serious delinquents. Concurrent validity for admitting offenses was higher for Caucasians, but concurrent validity for admitting arrests was higher for African‐Americans. There were no consistent ethnic differences in predictive validity. There was an increase in predictive validity, for both African‐Americans and Caucasians, by combining self‐report data with information from other sources. Afrer controlling for delinquency measures, African‐Americans were more likely than Caucasians to be petitioned in the future, but not in the past. In this research, ethnic differences in official delinquency were partly attributable to ethnic differences in delinquent behavior and were not attributable to differential ethnic attrition or differential ethnic validity of measures of delinquent behavior.

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