The rates of endorsement for the covariates are presented in Table 1. The percentage of respondents with no more than 12 years of education did not differ across the groups. Lifetime DSM-III-R depression was relatively consistent across groups, although individuals from pairs concordant for not using cannabis early had significantly lower rates than the other groups. There was evidence that early cannabis use was associated with other adolescent deviance (conduct disorder, early alcohol use, and early nicotine use). Southeast Asia service was relatively comparable across groups, but pairs concordant for not using cannabis early were significantly more likely to have served in Southeast Asia than members of the other groups. PTSD rates were lowest among the individuals in pairs concordant for not using cannabis early.
