rss
Evid Based Nurs 8:15 doi:10.1136/ebn.8.1.15
  • Treatment

Review: levonorgestrel and mifepristone are effective emergency methods for preventing pregnancy after unprotected intercourse

Pregnancy rates for various emergency contraceptive methods after unprotected intercourse*

Comparisons Number of trials (n) Weighted event rates RRR (95% CI) NNT (CI)
*Abbreviations defined in glossary; weighted event rates, RRR, NNT, and CI calculated from data in article using a fixed effects model.
Intrauterine device v expectant management 1 (300) 2% v 22% 91% (74 to 97) 5 (4 to 9)
Levonorgestrel v the Yuzpe regimen 2 (2789) 1.3% v 3.3% 49% (17 to 69) 50 (34 to ∞)
Mifepristone v the Yuzpe regimen 3 (2144) 0.45% v 2.5% 86% (59 to 95) 50 (34 to 100)
Mifepristone, 25–50 mg v ⩽10 mg 10 (8762) 0.73% v 1.7% 38% (12 to 57) 100 (100 to ∞)
Mifepristone v anordrin 3 (439) 0.09% v 4.1% 80% (8 to 96) 25 (15 to 100)
Mifepristone v danazol 2 (629) 0.47% v 4.5% 90% (45 to 98) 25 (15 to 50)

This Article

Free Sample

This recent issue is free to all users to allow everyone the opportunity to see the full scope and typical content of EBN.
View free sample issue >>

EBN Journal Chat

The EBN Journal Chat offers readers the opportunity to participate in discussion about research articles and commentaries from Evidence Based Nursing (EBN).

How to participate >>

Don't forget to sign up for content alerts so you keep up to date with all the articles as they are published.

Navigate This Article