Comparison 2. MI versus no MI (assessment only and alternative intervention) at < 4 months follow‐up.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Quantity of alcohol consumed	39	5600	Std. Mean Difference (Random, 95% CI)	‐0.17 [‐0.25, ‐0.09]
2 Frequency of alcohol consumption	24	3296	Std. Mean Difference (Random, 95% CI)	‐0.18 [‐0.29, ‐0.07]
3 Binge drinking	25	4090	Std. Mean Difference (Random, 95% CI)	‐0.13 [‐0.23, ‐0.03]
4 Alcohol problems	34	5109	Std. Mean Difference (Random, 95% CI)	‐0.10 [‐0.18, ‐0.01]
5 Average BAC	6	1096	Std. Mean Difference (IV, Random, 95% CI)	‐0.14 [‐0.30, 0.01]
6 Peak BAC	14	2408	Std. Mean Difference (IV, Random, 95% CI)	‐0.23 [‐0.32, ‐0.13]
7 Drink‐driving	4	895	Std. Mean Difference (IV, Random, 95% CI)	‐0.22 [‐0.38, ‐0.06]
8 Risky behaviour	5	745	Std. Mean Difference (IV, Random, 95% CI)	‐0.05 [‐0.33, 0.22]