Participants were asked six items about how frequently they engaged in a range of problem behaviors as teenagers (e.g., skipping school, stealing) on a four-point scale coded 0 (Never), 1 (1-2 times), 2 (3-5 times), 3 (6 or more times). Items were adapted from the Conduct Disorder section of the Semi-Structured Assessment for the Genetics of Alcoholism (Bucholz et al., 1994). Sum scores were calculated for use in analyses.
