Thirteen participants became ill (vomited) following alcohol consumption. Chi-square analyses indicated that those who became ill did not differ from the remainder of the sample in ADH1B or ADH1C status. These participants also did not differ in gender, weight, and past month frequency of alcohol consumption. However, there was a trend for those who became ill to report a lower quantity of past month alcohol consumption (t (114) = 1.87, p = .06; mean drinks per occasion: 3.05 vs. 2.33). As the research protocol was discontinued for these participants, they were excluded from study analyses. Excluding these participants, as well as participants with ADH1B*2, ALDH1A*2 or ALDH1A*3 alleles, resulted in a sample size of 91 for study analyses.
