in a different developmental period (i.e., adolescence). The lower levels and growth of alcohol use among AAs than for EAs, which could be attributed to differential community characteristics, peer and family processes (e.g., peer substance use, family support; Wallace 1999; Watt and Rogers 2007), could have led to the finding of genetic moderation on the slope easier than for EAs, for whom alcohol use during adolescence is regarded as more normative. Ethnic differences in these base rates and developmental processes could partly explain these differences across studies.
