Comparison 15. Maternal health intervention with smoking cessation component: counselling vs usual care.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Abstinence in late pregnancy	2	258	Risk Ratio (M‐H, Random, 95% CI)	0.93 [0.69, 1.25]
1.1 Single	2	258	Risk Ratio (M‐H, Random, 95% CI)	0.93 [0.69, 1.25]
2 Abstinence in late pregnancy: biochemically validated only	1	198	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.72, 1.40]
2.1 Single	1	198	Risk Ratio (M‐H, Random, 95% CI)	1.00 [0.72, 1.40]
3 Abstinence at 0 to 5 months postpartum	1	198	Risk Ratio (M‐H, Random, 95% CI)	1.46 [0.97, 2.19]
3.1 Single interventions	1	198	Risk Ratio (M‐H, Random, 95% CI)	1.46 [0.97, 2.19]
4 Smoking reduction: biochemical measures in late pregnancy	1	198	Std. Mean Difference (IV, Random, 95% CI)	0.11 [‐0.17, 0.39]
4.1 Mean cotinine	1	198	Std. Mean Difference (IV, Random, 95% CI)	0.11 [‐0.17, 0.39]