OBJECTIVE: To determine the effects of passive maternal smoking on birthweight. DESIGN: Cohort of consecutive singleton live births. SETTING: Teaching hospital in South India. SUBJECTS: 994 infants and their mothers. MAIN OUTCOME MEASURE: Birthweight. RESULTS: All the women were themselves non-smokers; 520 (52%) were passive smokers while the remainder were not exposed to tobacco smoke. Infants born to passive smokers were on the average 55 g lighter than those born to non-smokers. Passive smoking was associated with a decrease in birthweight of 63 g (95% CI 12-114 g) even after adjusting for other variables known to affect birthweight.
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Mathai et al. (1992) studied this question.
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