Outcomes at six month follow-up by trial arm
| Outcome over the last three months | Control N=301 | Brief advice N=291 | Coefficient/OR* 95% CI |
|---|---|---|---|
| Weekly alcohol consumption (units) | |||
| Mean (SD) | 20.3 (16.6) | 18.1 (15.6) | −2.33 |
| Median (IQR) | 15.7 (8.3–29.9) | 14.1 (6.5–25.1) | −4.69 to 0.03 |
| Had unprotected sex (%) | |||
| No | 123 (40.9) | 137 (47.1) | 0.89 |
| Yes | 178 (59.1) | 154 (52.9) | 0.63 to 1.25 |
| Average units on drinking days | |||
| Mean (SD) | 10.4 (5.8) | 9.3 (5.3) | −1.13 |
| Median (IQR) | 9.4 (6.5–13.4) | 8.6 (5.6–11.4) | −1.96 to −0.29 |
| Proportion of days abstinent | |||
| Mean, (SD) | 70.7 (22.6) | 70.9 (22.1) | 0.20 |
| Median (IQR) | 75.6 (62.2–87.8) | 75.6 (58.9–87.8) | −3.03 to 3.44 |
| Drinking excessively (M-SASQ) (%) | |||
| No | 55 (18.3) | 70 (24.1) | 0.70 |
| Yes | 246 (81.7) | 221 (75.9) | 0.46 to 1.05 |
| Number of sexual partners | |||
| Mean (SD) | 1.9 (2.9) | 1.6 (2.2) | −0.13 |
| Median (IQR) | 1 (1–2) | 1 (1–2) | −0.29 to 0.02 |
| Number of unprotected partners | |||
| Mean (SD) | 0.8 (1.1) | 0.6 (0.8) | −0.11 |
| Median (IQR) | 1 (0–1) | 1 (0–1) | −0.31 to 0.08 |
| Occurrence of regretted sex (%) | |||
| No | 273 (90.7) | 263 (90.4) | 1.05 |
| Yes | 28 (9.3) | 28 (9.6) | 0.60 to 1.84 |
| Unprotected sex after drinking (%) | |||
| No | 165 (54.8) | 183 (62.9) | 0.79 |
| Yes | 136 (45.2) | 108 (37.1) | 0.56 to 1.11 |
| Unprotected sex after feeling drunk (%) | |||
| No | 245 (81.4) | 234 (80.4) | 1.15 |
| Yes | 56 (18.6) | 57 (19.6) | 0.76 to 1.75 |
| Unplanned pregnancy (n=316) | |||
| No | 160 (98.8) | 152 (98.7) | 1.05 |
| Yes | 2 (1.2) | 2 (1.3) | 0.16 to 6.79 |
| New diagnosis of sexually transmitted infection | |||
| No | 287 (95.3) | 283 (97.3) | 0.58 |
| Yes | 14 (4.7) | 8 (2.7) | 0.25 to 1.384 |
| Health related quality of life (SD) | 0.922 (0.144) | 0.910 (0.150) | −0.013 −0.037 to 0.109 |
*Coefficient/OR from linear, logistic or negative binomial (number of sexual partners) regression for difference between arms, adjusted for age, gender, clinic and corresponding variable at baseline. Except for unplanned pregnancy and STI diagnosis where OR are unadjusted, CI mid-p estimates, and p value from Fisher's exact tests. M-SASQ, Modified-Single Alcohol Screening Question .