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American Journal of Epidemiology Vol. 130, No. 5: 950-957
Copyright © 1989 by The Johns Hopkins University School of Hygiene and Public Health

research-article

THE EFFECT OF CIGARETTE SMOKING ON THE RISK OF PREECLAMPSIA AND GESTATIONAL HYPERTENSION

SYLVIE MARCOUX, JACQUES BRISSON and JACQUELINE FABIA

From theEpidemiology Research Unit, Department of Social and Preventive Medicine, Laval University Sainte-Foy, Quebec, Canada G1K 7P4

Reprint requests to Dr. S. Marcoux at this address

This case-control study assessed the relation of cigarette smoking during pregnancy to the risk of preeclampsia and gestational hypertension. All subjects were primiparous women without a history of high blood pressure who gave birth in Quebec City or Montreal, Canada, hospitals between 1984 and 1986. Cases (172 women with preeclampsia and 251 with gestational hypertension) and 505 controls were interviewed at the hospital after delivery. Adjusted relative risks were estimated by polychotomous logistic regression. Compared with women who had never smoked, women who were smokers at the onset of pregnancy had a reduced risk of preeclampsia (relative risk = 0.51, 95% confidence interval 0.34-0.77). Relative risks of preeclampsia decreased with Increases in the number of cigarettes smoked daily at the onset of pregnancy: Relative risks among smokers of less than 11, 11-20, and more than 20 cigarettes per day were 0.79, 0.56, and 0.38, respectively (test for trend: p = 0.0002). The protective effect of smoking on preeclampsia was stronger for women who continued to smoke after 20 weeks of pregnancy. While smoking tended to reduce the risk of gestational hypertension, this effect was less evident than that for preeclampsia. Relative risks varied little with severity of disease as based on gestational age at the onset of hypertension, maximal blood pressure and, for preeclampsia, amount of proteinuria. The reduction in mean birth weight attributable to smoking during pregnancy was similar among cases and controls. Nicotine Inhibition of throm-boxane A2 production might explain the decreased risk of pregnancy-induced hypertension among smokers. Despite these findings, the harmful consequences of smoking on pregnancy outcome outweigh its protective effect against pregnancy-induced hypertension.

pre-eclampsia; pregnancy toxemias; smoking


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