Grimes D A, Techman T
Am J Obstet Gynecol. 1984 Jul 1;149(5):501-4. doi: 10.1016/0002-9378(84)90024-3.
Legal abortion has been postulated to be a risk factor for placenta previa in subsequent pregnancies. To examine this hypothesis, we analyzed the deliveries of 28,665 women. We identified 68 women who had had placenta previa and compared their obstetric histories with those of 68 controls randomly selected from the same group of deliveries. The crude risk ratio for women with a history of one or more legal abortions was 1.4 (95% confidence interval, 0.5 to 3.6; p greater than 0.05). Standardizing the crude risk ratio for the effects of age and gravidity reduced the risk ratio to 1.1 (95% confidence interval, 0.4 to 2.8). In this predominantly black population legal abortion does not appear to have a significant association with placenta previa in subsequent pregnancies.
人工流产被认为是后续妊娠中前置胎盘的一个风险因素。为检验这一假设，我们分析了28665名女性的分娩情况。我们识别出68名曾患前置胎盘的女性，并将她们的产科病史与从同一组分娩女性中随机选取的68名对照者的病史进行比较。有一次或多次人工流产史的女性的粗风险比为1.4（95%置信区间为0.5至3.6；p大于0.05）。对年龄和妊娠次数的影响进行粗风险比标准化后，风险比降至1.1（95%置信区间为0.4至2.8）。在这个以黑人为主的人群中，人工流产似乎与后续妊娠中的前置胎盘没有显著关联。
