Table 1 lists the demographic and clinical characteristics of the HR and LR samples. The groups showed no significant difference in their age (t value = −0.32, p = .75). Alcohol intake per month did not show any significant correlation with any of the dependent variables. However, the groups differed significantly in average alcohol intake per month for the past six months (t value = −2.14, p = .038). Therefore, to rule out any possible influence of alcohol consumption, average alcohol intake per month for the past six months was used as covariate. The covariate did not show any significant main or interaction effect in any of the analyses. The groups were not matched on substance use and other Axis I conditions, since the reported rates for some co-occurring conditions, such as substance use in subjects with family history of alcoholism, are elevated over normal population levels (Sher et al., 1991; Cuijpers et al., 1999). This was also observed in the current study where more HR subjects had marijuana dependence compared to LR subjects. Marijuana dependence could not be included
