|Weighted event rates|
|Outcomes||No of trials||SCI||UC||RRR (95% CI)||NNT (CI)|
|†Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article.|
|Continued smoking||31 (n=9081)||87%||91%||7% (6 to 9)||23 (18 to 29)|
|Low birth weight||7 (n=6578)||7.0%||8.5%||18% (3 to 31)||68 (37 to 496)|
Review: smoking cessation interventions during pregnancy reduce maternal smoking
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