1. Subgroup analysis, MI versus active control versus assessment only.
| Follow‐up | Outcome | SMD (95% CI), Active controls | SMD (95% CI), assessment only | Test for group differences |
| ≥ 4 months | Quantity of drinking | −0.12 (−0.19 to −0.06) | −0.11 (−0.15 to −0.03) | Chi2 = 0.40, df = 1 (P = 0.53) |
| Frequency of drinking | −0.10 (−0.20 to 0.00) | −0.14 (−0.21 to −0.07) | Chi2 = 0.77, df = 1 (P = 0.38) | |
| Binge drinking | −0.06 (−0.14 to 0.03) | −0.04 (−0.09 to 0.02) | Chi2 = 0.34, df = 1 (P = 0.56) | |
| Alcohol problems | −0.02 (−0.12 to 0.07) | −0.18 (−0.29 to −0.06) | Chi2 = 3.83, df = 1 (P = 0.05) | |
| < 4 months | Quantity of drinking | −0.11 (−0.21 to −0.02) | −0.23 (−0.36 to −0.10) | Chi2 = 1.62, df = 1 (P = 0.20) |
| Frequency of drinking | 0.00 (−0.15 to 0.14) | −0.33 (−0.44 to −0.23) | Chi2 = 12.73, df = 1 (P = 0.0004) | |
| Binge drinking | 0.00 (−0.13 to 0.13) | −0.21 (−0.35 to −0.08) | Chi2 = 4.62, df = 1 (P = 0.03) | |
| Alcohol problems | −0.01 (−0.12 to 0.10) | −0.18 (−0.29 to −0.07) | Chi2 = 4.50, df = 1 (P = 0.03) |
CI: confidence interval; df: degrees of freedom; SMD: standardised mean difference.