Comparison 4.

Smoking cessation interventions: health education vs less intensive intervention

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Abstinence in late pregnancy: biochemically validated	2	851	Risk Ratio (M-H, Random, 95% CI)	1.50 [0.97, 2.31]
1.1 Single interventions	1	653	Risk Ratio (M-H, Random, 95% CI)	1.46 [0.88, 2.43]
1.2 Multiple interventions	1	198	Risk Ratio (M-H, Random, 95% CI)	1.59 [0.68, 3.73]
2 Abstinence at 0 to 5 months postpartum	2		Risk Ratio (M-H, Random, 95% CI)	Subtotals only
2.1 Single interventions	2	844	Risk Ratio (M-H, Random, 95% CI)	1.29 [0.52, 3.22]