Comparison 1.

Brief alcohol reduction intervention versus alcohol assessment only

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Women who were abstinent following the intervention	1	250	Risk Ratio (M-H, Fixed, 95% CI)	1.11 [0.93, 1.33]
2 Women who remained abstinent throughout the study	1	142	Risk Ratio (M-H, Fixed, 95% CI)	1.20 [1.01, 1.42]
3 Number of antenatal alcohol drinking episodes	1	250	Mean Difference (IV, Fixed, 95% CI)	−0.30 [−0.68, 0.08]