Does passive smoking in early pregnancy increase the risk of small-for-gestational-age infants?
E Dejin-Karlsson,
B S Hanson,
P O Ostergren,
N O Sjöberg and
K Marsal
Department of Community Medicine, Malmö University Hospital, Sweden.
OBJECTIVES: This study tested the hypothesis that women whodeliver small-for-gestational-age infants are more often exposedto passive smoking at home or at work. METHODS: Among a 1-yearcohort of nulliparous women in the city of Malmö, Sweden872 (87.7%) women completed a questionnaire during their firstprenatal visit. The study was carried out among women whosepregnancies resulted in a singleton live birth (n = 826), 6.7%of infants were classified as small for their gestational age.RESULTS: Passive smoking in early pregnancy was shown to doublea woman's risk of delivering a small-for-gestational-age infant,independent of potential confounding factors such as age, height,weight, nationality, educational level, and the mother's ownactive smoking (odds ratio [OR] = 2.7). A stratified analysisindicated interactional effects of maternal smoking and passivesmoking on relative small-for-gestational-age risk. CONCLUSIONS:Based on an attributable risk estimate, a considerable reductionin the incidence of small-for-gestational-age births could bereached if pregnant women were not exposed to passive smoking.
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