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按世界卫生组织报道,宫内节育器(IUD)80％的使用者在中国。为了提高避孕效果,着重对使用新型活性IUD的频繁脱落(简称频脱)者要求再次放置者继续存放率与初次放置者(简称初放)作对比性研究。
According to the World Health Organization, 80% of IUD users are in China. In order to improve the contraceptive effect, emphasis should be placed on the comparative study of the rate of continuation of re-placement with those of the initial placement (referred to as initial release) with frequent shedding of new active IUDs.