“…Figlio et al (1991) employed a stratified sampling scheme to ensure that they captured the most relevant background and juvenile arrest characteristics of the cohort, and yield a sample size sufficient for analysis. The male population was stratified by race, socioeconomic status, arrest history (0, 1, 2-4, 5 or more arrests), and juvenile 'status' arrests, which are arrest categories only applicable to individuals less than 18 years of age.…”