Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA.
Am J Obstet Gynecol. 2011 Nov;205(5):458.e1-7. doi: 10.1016/j.ajog.2011.06.018. Epub 2011 Jun 15.
The objective of the study was to determine the trends and racial differences in late preterm induction (LPI) of labor in the United States.
Data from the National Vital Statistics System were used to identify women eligible for induction between 34 and 42 weeks' gestation from 1991 to 2006. Annual LPI rates were calculated, and maternal race/ethnicity was classified into 4 groups. Changes in the frequency and odds of LPI, stratified by race/ethnicity, were assessed using logistic regression.
Among the 42.0 million eligible women, LPI rates increased from 0.46% to 1.37% (P < .01) over 16 years. LPI rates were highest for black women (P < .01) each year, and after adjusting for confounding factors, the odds of LPI were highest (P < .01) and rose most rapidly (P < .01) for black women (non-Hispanic white: odds ratio [OR], 1 [referent]; Hispanic white: OR, 0.76; black: OR, 1.31; other: OR, 0.81; P < .01).
LPI rates were persistently highest and rose most rapidly for black women.
本研究旨在确定美国晚期早产儿引产（LPI）的趋势和种族差异。
利用国家生命统计系统的数据，鉴定了 1991 年至 2006 年期间妊娠 34 至 42 周适合引产的女性。计算了每年 LPI 的发生率，并将产妇的种族/民族分为 4 组。使用逻辑回归评估了按种族/民族分层后 LPI 的频率和可能性的变化。
在 4200 万符合条件的女性中，LPI 的发生率在 16 年内从 0.46%上升到 1.37%（P <.01）。每年 LPI 的发生率最高的是黑人女性（P <.01），并且在调整了混杂因素后，黑人女性的 LPI 可能性最高（P <.01），并且上升最快（P <.01）（非西班牙裔白人：比值比[OR]，1[参考]；西班牙裔白人：OR，0.76；黑人：OR，1.31；其他：OR，0.81；P <.01）。
黑人女性的 LPI 发生率一直最高，且上升最快。
