|Outcome||Number of trials||Follow up||Comparison||Event rates||RRI (95% CI)||NNH (CI)|
|*Abbreviations defined in glossary; RRI, NNH, and CI calculated from data in article using a fixed effects model.|
|Pregnancy||1||24 months||Prentif cap v diaphragm||15.4% v 12.4%||21% (−10 to 61)||Not significant|
|1||6 months||FemCap v diaphragm||9.5% v 5.5%||71% (1 to 187)||25 (13 to 660)|
Review: the Prentif cervical cap was as effective as the diaphragm in preventing pregnancy, and the FemCap was not
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