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Prenatal Secondhand Smoke Exposure and Infant Birth Weight in China
Department of Epidemiology, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA
Department of Epidemiology and Biostatistics, School of Public Health, Drexel University, Philadelphia, PA 19102, USA
Department of Preventive Medicine, Keck School of Medicine and USC Institute for Global Health, University of Southern California, Los Angeles, CA 90089, USA
Chinese Center for Disease Control and Prevention, Beijing 100050, China
Center for Public Health Surveillance and Information Service, Chinese Center for Disease Control and Prevention, Beijing 100050, China
National Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing 100050, China
Department of Medicine, University of Mississippi Medical Center, Jackson, MS 39213, USA
Department of Environmental Health Sciences, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205, USA
* Author to whom correspondence should be addressed.
Received: 6 January 2012; in revised form: 5 September 2012 / Accepted: 17 September 2012 / Published: 26 September 2012
Abstract: Epidemiologic evidence provides some support for a causal association between maternal secondhand smoke (SHS) exposure during pregnancy and reduction in infant birth weight. The purpose of this cross-sectional study is to examine the magnitude of this association in China, where both prevalence and dose of SHS exposure are thought to be higher than in U.S. populations. Women who gave birth in Beijing and Changchun September 2000–November 2001 were interviewed to quantify self-reported prenatal SHS exposure. Their medical records were reviewed for data on pregnancy complications and birth outcomes. Non-smoking women who delivered term babies (≥37 weeks gestation) were included in the study (N = 2,770). Nearly a quarter of the women (24%) reported daily SHS exposure, 47% reported no prenatal exposure, and 75% denied any SHS exposure from the husband smoking at home. Overall, no deficit in mean birth weight was observed with exposure from all sources of SHS combined (+11 grams, 95% CI: +2, +21). Infants had higher mean birth weights among the exposed than the unexposed for all measures of SHS exposure. Future studies on SHS exposure and infant birth weight in China should emphasize more objective measures of exposure to quantify and account for any exposure misclassification.
Keywords: secondhand smoke; China; birth weight; pregnancy; perinatal; epidemiology
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MDPI and ACS Style
Lee, N.L.; Samet, J.M.; Yang, G.; Zhou, M.; Yang, J.; Correa, A.; Lees, P.S.J. Prenatal Secondhand Smoke Exposure and Infant Birth Weight in China. Int. J. Environ. Res. Public Health 2012, 9, 3398-3420.
Lee NL, Samet JM, Yang G, Zhou M, Yang J, Correa A, Lees PSJ. Prenatal Secondhand Smoke Exposure and Infant Birth Weight in China. International Journal of Environmental Research and Public Health. 2012; 9(10):3398-3420.
Lee, Nora L.; Samet, Jonathan M.; Yang, Gonghuan; Zhou, Maigeng; Yang, Jie; Correa, Adolfo; Lees, Peter S. J. 2012. "Prenatal Secondhand Smoke Exposure and Infant Birth Weight in China." Int. J. Environ. Res. Public Health 9, no. 10: 3398-3420.