Characteristics of patients who participated in the trial, by group to which their physician was allocated
| Characteristic | Group; no. (%) of patients* | |
|---|---|---|
| Intervention n = 287 | Control n = 307 | |
| Age, yr, mean ± SD | 18.4 ± 2.5 | 18.6 ± 2.7 |
| Sex, male | 140 (48.8) | 138 (45.0) |
| Student | 159 (55.4) | 169 (55.0) |
| Self-assessed health rated as excellent or very good | 162 (56.4) | 167 (54.4) |
| No. of lifetime sexual partners, median (IQR) | 1 (0–4) | 1 (0–4) |
| Daily tobacco use | 72 (25.1) | 65 (21.2) |
| Alcohol use | ||
| None | 73 (25.4) | 72 (23.5) |
| No. of episodes of binge drinking in past 12 mo, median (IQR) | 2 (0–9) | 2 (0–9) |
| Excessive use (≥ 1 episode of binge drinking in past 30 d) | 114 (39.7) | 142 (46.3) |
| High-risk binge drinking (≥ 2 episodes in past 30 d) | 74 (25.8) | 90 (29.3) |
| Cannabis use | ||
| None | 219 (76.3) | 257 (83.7) |
| Excessive use (≥ 1 joint per wk) | 36 (12.5) | 29 (9.4) |
| Any excessive substance use (cannabis, alcohol or both) | 130 (45.3) | 149 (48.5) |
Note: IQR = interquartile range, SD = standard deviation.
↵* Unless stated otherwise.