Editor-in-Chief: Dudenhausen, Joachim W.
Editorial Board Member: / Bancalari, Eduardo / Milner, Anne / Genc, Mehmet R. / Chervenak, Frank A. / Chappelle, Joseph / Bergmann, Renate L. / Bernardes, J.F. / Bevilacqua, G. / Blickstein, Isaac / Cabero Roura, Luis / Carbonell-Estrany, Xavier / Carrera, Jose M. / D`Addario, Vincenzo / D'Alton, MD, Mary E. / Dimitrou, G. / Grunebaum, Amos / Hentschel, Roland / Köpcke, W. / Kawabata, Ichiro / Keirse, Marc J.N.C. / Kurjak M.D., Asim / Lee, Ben H. / Levene, Malcolm / Lockwood, Charles J. / Marsal, Karel / Makatsariya, Alexander / Nishida, Hiroshi / Ogata, Edward / Papp, Zoltán / Pejaver, Ranjan Kumar / Pooh, Ritsuko K. / Romero, Roberto / Saugstad, Ola D. / Schenker, Joseph G. / Sen, Cihat / Seri, Istvan / Vetter, Klaus / Winn, Hung N. / Young, Bruce K. / Zimmermann, Roland
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Aims: Cigarette smoking during pregnancy is associated with a lower risk of preeclampsia, whereas obesity increases the risk of preeclampsia. We sought to assess the combined effect of smoking and obesity on the risk of preeclampsia.
Methods: We conducted a population-based cohort study of 129,674 women who delivered singleton infants during 2000–2001. Data for cigarette use, pre-pregnancy body mass index (BMI), preeclampsia, and potential confounders were obtained from birth certificate files. Mantel-Haenszel stratified analysis and logistic regression were used to analyze the data.
Results: The preeclampsia risk was 3.1, 4.5, 7.6 and 8.8% for normal weight (BMI 18.5–24.9), overweight (25.0–29.9), obese (30.0–39.9) and morbidly obese (≥40.0 kg/m2) women, respectively, who smoked cigarettes while pregnant. The preeclampsia risk was 3.9, 6.2, 9.0 and 12.3% for the same groups of women, respectively, who did not smoke during their pregnancy. Compared to non-smokers, the relative risk of preeclampsia for women who smoked cigarettes was 0.78 (95% confidence interval 0.73–0.83) before and after adjusting for pre-pregnancy BMI and other factors associated with preeclampsia.
Conclusion: The risk of preeclampsia is lower for women who smoke cigarettes while pregnant regardless of their pre-pregnancy BMI.
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