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征集３１５例健康妇女，将其分成Ａ、Ｂ两组，Ａ组房事后７２ｈ内单次口服米非司酮１５０ｍｇ；Ｂ组：２５ｍｇ。结果Ａ、Ｂ两组实际妊娠率分别为２．４８％、１．８２％，两组间无显著差异，与预期妊娠率（１２．１９％、１１．７１％）相比有显著差异。服药后第一次月经，在卵泡期服药者月经周期延长，Ａ组，３３．９％，Ｂ组；２６．９％。黄体期服药者月经周期准时或提早，Ａ组：７１．２％，Ｂ组：７７．１％，两组之间无差别。Ａ、Ｂ两组月经量正常者分别为８１％、９３％，经期均无改变，显示了米非司酮作为事后避孕药对月经无明显影响。可选择小剂量２５ｍｇ作为事后避孕药。
315 healthy women were enrolled and divided into A and B groups. Group A received 150 mg of mifepristone once within 72 hours after taking the medicine. Group B: 25 mg. Results The actual pregnancy rates in groups A and B were 2.48% and 1.82%, respectively. There was no significant difference between the two groups, which was significantly different from the expected pregnancy rate (12.19% and 11.71%). After taking the first menstruation, the menstrual cycle in the follicular period was extended, A group, 33.9%, B group; 26.9%. Periodontal administration of luteal phase medication on time or earlier, A group: 71.2%, B group: 77.1%, no difference between the two groups. A, B, two groups were normal menstrual flow were 81%, 93%, menstrual did not change, showing that mifepristone as an after-treatment contraceptives had no significant effect on menstruation. Can choose a small dose of 25mg as a contraceptive pill.