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JIE QIU; XIAOCHUN HE; HAIYA BAI; RUIFENG XU; DALING ZHU; XIAOJUAN LIN; LING LV; XIAOYING XU; RU LIN; TINGTING YAO; JIE SU; XIAOHUI LIU; HONGMEI CUI; WENDI WANG; YUEYUAN WANG; BIN MA; SUFEN LIU; HUANG HUANG; LERRO, Catherine; NAN ZHAO; JIAXIN LIANG; SHUANGGE MA; EHRENKRANZ, Richard A; CHONG ZHANG; QING LIU; YAWEI ZHANG; HONGHONG ZHANG; YUN DANG; XUDONG HAN; YA CHEN; ZHONGFENG TANG; HANRU ZHANG
American journal of epidemiology, 07/2014, Volume: 180, Issue: 1Journal Article
Studies investigating the relationship between maternal passive smoking and the risk of preterm birth have reached inconsistent conclusions. A birth cohort study that included 10,095 nonsmoking women who delivered a singleton live birth was carried out in Lanzhou, China, between 2010 and 2012. Exposure to passive smoking during pregnancy was associated with an increased risk of very preterm birth (<32 completed weeks of gestation; odds ratio = 1.98, 95% confidence interval: 1.41, 2.76) but not moderate preterm birth (32-36 completed weeks of gestation; odds ratio = 0.98, 95% confidence interval: 0.81, 1.19). Risk of very preterm birth increased with the duration of exposure (P for trend = 0.0014). There was no variability in exposures by trimester. The associations were consistent for both medically indicated and spontaneous preterm births. Overall, our findings support a positive association between passive smoking and the risk of very preterm birth.
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