Groups did not significantly differ on demographic variables including age, gender distribution, ethnic composition, and socioeconomic status (Hollingshead, 1965) (see Table 1). Measures of emotional functioning and psychopathology were similar between groups and within normal limits. Estimated premorbid IQ and academic reading achievement were also comparable between groups, typically falling in the average to high average range. As expected, MJ+ALC youths were more likely to have a parental history of substance use disorder (p<.05), and more nicotine (p<.05) and other drug (p<.001) use than controls, so these variables were included as covariates in statistical analyses.
