2=28.1%, class 3=31.0%), nor did they differ significantly by age (class 1: M = 19.15 [SD = 2.57], class 2: M =18.79 [SD = 1.07], class 3: M =18.93 [SD = 0.94]) or likelihood of having a positive family history of alcohol-related problems (class 1=36.6%, class 2=30.6%, class 3=53.6%). The family history difference was a non-significant trend as just over half of class 3 was family history positive X2 (N = 352) = 5.17, p = .075.
