Advance provision of emergency contraception for pregnancy prevention

作者：Chelsea Bernhardt Polis, David A. Grimes, Kate Schaffer, Kelly N. Blanchard, AnnaF. Glasier, Cynthia C. Harper · 发表于：Cochrane Database of Systematic Reviews · 年份：2007 · DOI：10.1002/14651858.cd005497.pub2 · 被引用次数：145 · 研究领域：Reproductive Health and Contraception、Global Maternal and Child Health、Reproductive tract infections research

BACKGROUND: Emergency contraception can prevent pregnancy when taken after unprotected intercourse. Obtaining emergency contraception within the recommended time frame is difficult for many women. Advance provision, in which women receive a supply of emergency contraception before unprotected sex, could circumvent some obstacles to timely use. OBJECTIVES: To summarize randomized controlled trials evaluating advance provision of emergency contraception to explore effects on pregnancy rates, sexually transmitted infections, and sexual and contraceptive behaviors. SEARCH STRATEGY: In August 2006, we searched CENTRAL, EMBASE, POPLINE, MEDLINE via PubMed, and a specialized emergency contraception article database. We also searched reference lists and contacted experts to identify additional published or unpublished trials. SELECTION CRITERIA: We included randomized controlled trials comparing advance provision and standard access, which was defined as any of the following: counseling which may or may not have included information about emergency contraception, or provision of emergency contraception on request at a clinic or pharmacy. DATA COLLECTION AND ANALYSIS: We evaluated all identified titles and abstracts found for potential inclusion. Two reviewers independently abstracted data and assessed study quality. We entered and analyzed data using RevMan 4.2.8. We calculated odds ratios with 95% confidence intervals for dichotomous data and weighted mean differences with 95% confi...