Comparison 1. Perioperative alcohol cessation intervention versus treatment as usual.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Postoperative complications after perioperative intervention	3		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
1.1 Intensive intervention	3	122	Risk Ratio (M‐H, Random, 95% CI)	0.62 [0.40, 0.96]
2 In‐hospital and 30‐day mortality after perioperative intervention	3		Risk Ratio (M‐H, Random, 95% CI)	Subtotals only
2.1 Intensive intervention	3	122	Risk Ratio (M‐H, Random, 95% CI)	0.47 [0.07, 2.96]
3 Successful quitters (number of abstainers) following preoperative and perioperative interventions	3	140	Risk Ratio (M‐H, Random, 95% CI)	8.22 [1.67, 40.44]