Comparison 11. Smoking cessation interventions: incentives vs alternative intervention.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Abstinence in late pregnancy	4	212	Risk Ratio (M‐H, Random, 95% CI)	2.36 [1.36, 4.09]
1.1 Single interventions	2	94	Risk Ratio (M‐H, Random, 95% CI)	2.19 [0.53, 9.04]
1.2 Multiple interventions	2	118	Risk Ratio (M‐H, Random, 95% CI)	2.20 [1.06, 4.55]
2 Abstinence in late pregnancy: biochemicaly validated only	4	212	Risk Ratio (M‐H, Random, 95% CI)	2.36 [1.36, 4.09]
2.1 Single interventions	2	94	Risk Ratio (M‐H, Random, 95% CI)	2.19 [0.53, 9.04]
2.2 Multiple interventions	2	118	Risk Ratio (M‐H, Random, 95% CI)	2.20 [1.06, 4.55]
3 Abstinence at 0 to 5 months postpartum	3	195	Risk Ratio (M‐H, Random, 95% CI)	1.79 [0.57, 5.61]
3.1 Single interventions	1	77	Risk Ratio (M‐H, Random, 95% CI)	9.73 [1.29, 73.13]
3.2 Multiple interventions	2	118	Risk Ratio (M‐H, Random, 95% CI)	1.13 [0.51, 2.52]
4 Abstinence at 6 to 11 months postpartum	3	195	Risk Ratio (M‐H, Random, 95% CI)	0.93 [0.85, 1.01]
4.1 Single interventions	1	77	Risk Ratio (M‐H, Random, 95% CI)	0.94 [0.85, 1.05]
4.2 Multiple interventions	2	118	Risk Ratio (M‐H, Random, 95% CI)	0.90 [0.79, 1.03]
5 Smoking reduction: numbers of women reducing smoking in late pregnancy (biochemically validated)	1	17	Risk Ratio (M‐H, Random, 95% CI)	0.71 [0.18, 2.88]
5.1 Single interventions	1	17	Risk Ratio (M‐H, Random, 95% CI)	0.71 [0.18, 2.88]
6 Low birthweight (under 2500 g)	3	184	Risk Ratio (M‐H, Fixed, 95% CI)	0.60 [0.26, 1.40]
6.1 Single interventions	1	73	Risk Ratio (M‐H, Fixed, 95% CI)	0.43 [0.12, 1.49]
6.2 Multiple interventions	2	111	Risk Ratio (M‐H, Fixed, 95% CI)	0.84 [0.26, 2.69]
7 Preterm birth (under 37 weeks)	3	184	Risk Ratio (M‐H, Random, 95% CI)	0.48 [0.20, 1.14]
7.1 Single interventions	1	73	Risk Ratio (M‐H, Random, 95% CI)	0.38 [0.11, 1.30]
7.2 Multiple interventions	2	111	Risk Ratio (M‐H, Random, 95% CI)	0.60 [0.17, 2.12]
8 Mean birthweight	3	184	Mean Difference (IV, Random, 95% CI)	134.58 [76.32, 192.83]
8.1 Single interventions	1	73	Mean Difference (IV, Random, 95% CI)	253.0 [‐3.67, 509.67]
8.2 Multiple interventions	2	111	Mean Difference (IV, Random, 95% CI)	128.48 [65.86, 191.10]
9 NICU admissions	3	184	Risk Ratio (M‐H, Random, 95% CI)	0.64 [0.26, 1.55]
9.1 Single interventions	1	73	Risk Ratio (M‐H, Random, 95% CI)	0.76 [0.24, 2.49]
9.2 Multiple interventions	2	111	Risk Ratio (M‐H, Random, 95% CI)	0.49 [0.13, 1.95]