Approximately 8 years after participants reported on their CD symptoms, they were asked to report on their adult antisocial behavior – antisocial behavior they had engaged in since turning 18 years old. The measure of antisocial behavior we used was based on the measure of adult antisocial behavior used by Jacobson et al. (2002). However, whereas Jacobson et al. assessed CD and AAB via self-report questionnaires, we collected these data via structured diagnostic telephone interview. Participants were asked to report on the frequency with which they had engaged in 17 specific behaviors – behaviors that correspond to the 7 adult criteria for DSM-IV antisocial personality disorder (these items can be found in Kendler & Prescott, 2006, p. 83-84). The response options for each of the 17 behaviors were: never, 1-2 times, 3-5 times, and 6 or more times. A computer algorithm was used to combine the responses for each of the 17 behaviors into a 7-item scale. Each of the 7 adult antisocial personality disorder criteria was considered present if the sum of the frequency of the behaviors indexing it
