2. Subgroup analysis, university/college settings versus other settings.

Follow‐up	Outcome	SMD (95% CI), university/college	SMD (95% CI), other settings	Test for group differences
≥ 4 months	Quantity of drinking	−0.13 (−0.19 to −0.08)	−0.06 (−0.14 to 0.02)	Chi2 = 2.24, df = 1 (P = 0.13)
	Frequency of drinking	−0.12 (−0.21 to −0.04)	−0.17 (−0.31 to −0.03)	Chi2 = 0.28, df = 1 (P = 0.60)
	Binge drinking	−0.04 (−0.11 to 0.03)	−0.06 (−0.18 to 0.07)	Chi2 = 0.04, df = 1 (P = 0.85)
	Alcohol problems	−0.10 (−0.19 to −0.02)	−0.02 (−0.21 to 0.16)	Chi2 = 0.54, df = 1 (P = 0.46)

CI: confidence interval; df: degrees of freedom; SMD: standardised mean difference.