Cervical cap v diaphragm for contraception*

OutcomeNumber of trialsFollow upComparisonEvent ratesRRI (95% CI)NNH (CI)
*Abbreviations defined in glossary; RRI, NNH, and CI calculated from data in article using a fixed effects model.
Pregnancy124 monthsPrentif cap v diaphragm15.4% v 12.4%21% (−10 to 61)Not significant
1 6 monthsFemCap v diaphragm 9.5% v 5.5%71% (1 to 187)25 (13 to 660)