The data analyzed here come from the Phase IV Prospective Study of the COGA sample. The recruitment of adolescents (12–17-year-olds) and young adults (18–21-year-olds) into the prospective study began in December 2004. All of these subjects had at least one parent who was interviewed in a previous phase of COGA, including both families affected with alcoholism and comparison families. Both parents have been personally interviewed for over 50% of the subjects. Data collection is ongoing, as individuals who reach their 12th year continue to be recruited and assessed. Follow-up evaluations are being conducted approximately every two years. All analyses reported here involve the initial assessments for participants (N = 2,128 individuals, 49% male).
