Taylor V M, Kramer M D, Vaughan T L, Peacock S
Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington.
Obstet Gynecol. 1994 Jul;84(1):55-7.
To investigate the occurrence of placenta previa following a cesarean delivery.
We conducted a case-control study using 1984-1987 Washington state birth certificate data. Analysis was restricted to women who reported one or more previous live births. The study population included 490 women with a pregnancy complicated by placenta previa and 1477 randomly selected controls. Unconditional logistic regression was used for statistical analysis.
After adjustment for confounding factors, the odds ratio for placenta previa in association with one or more previous cesarean deliveries was 1.48 (95% confidence interval 1.13-1.95).
Women with a history of cesarean delivery are 50% more likely to have a subsequent birth complicated by placenta previa than those without such a history. This magnitude of excess risk is lower than the relative risks reported in previous studies.
研究剖宫产术后前置胎盘的发生率。
我们利用1984 - 1987年华盛顿州出生证明数据进行了一项病例对照研究。分析仅限于报告有一次或多次既往活产史的女性。研究人群包括490例妊娠合并前置胎盘的女性和1477例随机选取的对照。采用非条件逻辑回归进行统计分析。
在对混杂因素进行调整后，有一次或多次既往剖宫产史的女性发生前置胎盘的比值比为1.48（95%置信区间1.13 - 1.95）。
有剖宫产史的女性随后分娩并发前置胎盘的可能性比无此病史的女性高50%。这种额外风险的程度低于先前研究报告的相对风险。
