What Interventions Are Most Effective for Emergency Contraception?

Authors included 115 randomized controlled trials (60,479 women) from 2,511 studies screened, 92 of which were conducted in China. Study inclusion and exclusion criteria were similar among included trials, with exclusion of women evaluated after 72 hours and those with multiple episodes of unprotected intercourse, with irregular menstrual periods, or using hormonal contraception. Double blinding occurred in 23 trials.

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