Data were collected with a modified Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA-OZ) (Bucholz et al., 1994; Hesselbrock et al., 1999), adapted for administration via telephone and updated for DSM-IV diagnostic criteria. Detailed histories of alcohol, cannabis and other substance use were gathered through SSAGA-based interviews, as were diagnostic criteria for substance use, mood, conduct, and anxiety disorders.
