Document Detail

A guide to interpreting contraceptive efficacy studies.
MedLine Citation:
PMID:  2199875     Owner:  NLM     Status:  MEDLINE    
Results of trials of various birth control methods and contraceptive products may provide misleading data and engender unrealistic expectations regarding efficacy. An analysis of published efficacy-trials reveals numerous fallacies in their design, performance, and reporting. Consequently, family planning clinicians find it virtually impossible to make valid comparisons among the methods or products. This article reviews the definitions and measures that have been used to assess contraceptive efficacy, describes and illustrates some of the flaws that confound interpretation and comparison of studies, and presents a set of recommendations for future studies. A summary table providing comparative failure rates for all methods of contraception is included.
J Trussell; R A Hatcher; W Cates; F H Stewart; K Kost
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Obstetrics and gynecology     Volume:  76     ISSN:  0029-7844     ISO Abbreviation:  Obstet Gynecol     Publication Date:  1990 Sep 
Date Detail:
Created Date:  1990-09-13     Completed Date:  1990-09-13     Revised Date:  2009-10-26    
Medline Journal Info:
Nlm Unique ID:  0401101     Medline TA:  Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  558-67     Citation Subset:  AIM; IM; J    
Office of Population Research, Princeton University, New Jersey.
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MeSH Terms
Confounding Factors (Epidemiology)
Contraceptive Agents*
Contraceptive Devices*
Pregnancy, Unwanted
Research Design
Reg. No./Substance:
0/Contraceptive Agents

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