Contact: Diane Duke Williams
Washington University School of Medicine
Caption: A study to evaluate birth control methods has found dramatic differences in their effectiveness. Women who used birth control pills, the patch or vaginal ring were 20 times more likely to have an unintended pregnancy than those who used longer-acting forms such as an intrauterine device (IUD) or implant. Results of the study, by researchers at Washington University School of Medicine in St. Louis, are reported May 24 in the New England Journal of Medicine.
Credit: Jim Dryden
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Related news release: IUDs, implants most effective birth control