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许多研究曾附带发现,口服避孕药(OC)具有预防盆腔感染(PID)的作用。为研究 OC 与PID 之间的相关性,作者对妇女保健研究(WHS)的大量资料进行了详尽的分析。结果表明,服用OC 者与未服用者相比,其发生 PID 的危险确实要小。作者自 WHS 的病例中选择648例 PID 妇女和2,516例对照妇女,年龄均在18～44岁。按服用 OC的时限将研究对象分为:目前服用者(研究之前3个月内一直服用者);过去服用者(研究之前服用
Many studies have found that oral contraceptives (OC) have the effect of preventing pelvic infection (PID). To study the correlation between OC and PID, the author gave a detailed analysis of a large amount of data on WHS. The results showed that, taking OC compared with non-users, the risk of PID is indeed smaller. The authors selected 648 PID women and 2,516 control women from the WHS, all ages 18 to 44 years. According to the timing of taking OC, the subjects were divided into: current users (those who had been taking them within 3 months prior to the study); past users (those who took before the study