Delinquency in Two Birth Cohorts

The material presented here is derived from the birth cohort study conducted at the Center for Studies in Criminology and Criminal Law at the University of Pennsylvania. The first display of this work was published as Delinquency in a Birth Cohort in 1972.1 The study involved analysis of a cohort of males born in 1945 who lived in Philadelphia from at least their tenth to their eighteenth birthdays. Through the use of school, police and Selective Service files, we were able to locate and gather data on 9945 boys. Since 1968 we have followed a ten percent random sample of the original cohort.