Interview assessment was performed using the Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA) to gather reliable and valid information on alcohol use behaviors (Bucholz et al., 1995; Bucholz et al., 1994; Hesselbrock et al., 1999). Participants 18 years and older were assessed with the Phase IV SSAGA, and those less than 18 years were assessed with an age appropriate adolescent version called the Phase IV C-SSAGA (Kuperman et al., 2001).
