tolerance (30%) or drink more than intended (28%). Individuals in this class began drinking regularly at a significantly older age (19.5 years) than those in the moderate (p<0.0001) or high-risk (p<0.0001) classes. In the moderate risk class, 66% were AD, with 92% of this class endorsing drink more than intended, and more than 50% endorsing use despite physical/psychological problems (56%), persistent desire/inability to cut down (73%), or tolerance (68%). On average they began regular drinking earlier (17.6 years) than their counterparts assigned to the low risk class (p<0.0001). The third class was composed primarily of AD (99%) individuals, with the majority endorsing use despite physical/psychological problems (98%), drink more than intended (98%), or persistent desire/inability to cut down (97%). These individuals began drinking at the youngest age (16.8 years) compared to their counterparts in the moderate (p=0.01) and low-risk (p<0.0001) classes. Individuals in this class were significantly older (55.0 years) than individuals in the low-risk (46.3 years, p=0.03) but not the moderate-risk (49.3 years, p=0.19) classes. There were no significant differences in age between the low- and moderate-risk classes (p=0.61) or between the moderate- and high-risk classes (p=0.19).
