The trend analyses were repeated with the 18–20 and 21–23 year age groups each divided into student and non-student groups; these results are shown at the bottom of Table 2. Because our interest was in students in a college environment, or similar setting, 18 year-old high-school students were classified as “non-students”. For men, the reduction in relative risk for binge drinking among 18–20 year olds was significantly larger among non-students than for students (trend OR=0.970 per year, 95% CI: 0.961,0.980, p<0.001 vs. OR=0.990 per year, 95% CI: 0.981, 0.999, p=0.09, respectively). Trends for 21–23 year old males did not differ by student status. For women, trends were similar for students and non-students in the 18–20 year age group, but diverged in the 21–23 year age group; with increases in relative risk for binge drinking being higher among students compared with non-students (trend OR=1.035 per year, 95% CI 1.018, 1.052, p<0.001 vs. trend OR=1.013, 95% CI: 1.002, 1.025, p=0.02).
