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本研究用回顾性队列研究的方法，在江苏太仓地区对６６８例低剂量国产１号口服避孕片（ＯＣ）使用者和８１４例ＩＵＤ使用者（服药或用ＩＵＤ５～１５年）的人工流产状况及其影响因素进行分析。结果表明：在长期连续使用不同避孕措施的妇女中，长期服用低剂量ＯＣ者平均妊娠数为２．２４，远低于ＩＵＤ组的２．４０（Ｐ＜０．０１）；ＯＣ组平均人工流产数为０．５６，远低于ＩＵＤ组的０．７５；ＯＣ组从未人工流产的比例为４６％，远高于ＩＵＤ组的２９％。多元回归分析结果表明，妊娠数、活产数、是否使用ＯＣ、末次妊娠年龄、第一次活产年龄和妇女年龄均为人工流产的主要影响因素。故认为ＯＣ比ＩＵＤ具有较高的避孕有效率
In this study, a retrospective cohort study was conducted in Taicang, Jiangsu Province on the abortion status of 668 low birth weight oral contraceptive tablets (OC) users and 814 IUD users (taking drugs or using IUD for 5 to 15 years) Its influencing factors are analyzed. The results showed that in the long-term continuous use of different contraceptive measures in women, long-term low-dose consumption of OC average pregnancy was 2.24, well below the IUD 2.40 (P <0.01); OC average abortion The number was 0.56, which was much lower than 0.75 in the IUD group. The proportion of never-induced abortion in the OC group was 46%, much higher than 29% in the IUD group. Multivariate regression analysis showed that the number of pregnancies, live births, whether the use of OC, the last gestational age, the first live birth age and women’s age are the main factors for abortion. Therefore, OC has a higher contraceptive efficiency than IUD