Mean AUDIT score ± SEM in participants with a diagnosis of alcohol dependence at any assessment. Mean AUDIT score was significantly higher in European American Thr129 carriers versus Pro129/Pro129 homozygotes. European Americans: Thr129/Thr129 n = 3, Thr129/Pro129 n = 10, Pro129/Pro129 n = 50, African Americans: Thr129/Thr129 n = 19, Thr129/Pro129 n = 74, Pro129/Pro129 n = 51. **p<0.01