Objective To evaluate the effect of health and behavior relevant influencing factors during pregnancy on newborn's weight.
Methods Pregnant women from a district of Shanghai with less than 20 gestation weeks were enrolled in a cohort study.A total of 2 768 pregnant women gave birth to single live full-term neonates.The relationships between second-hand smoke (SHS) exposure,educational level,and economic status and low birth weight were analyzed by χ2 test and logistic regression model.
Results Of the 2 768 pregnant women studied,1 284(46.4%) were exposed to SHS at least in the first or third trimester.Maternal short stature (Model 1:OR=0.9,95% CI 0.840-0.996;Model 2:OR=0.9,95% CI 00.860-0.998) and suffering from diseases during pregnancy (Model 1:OR=2.7,95% CI 01.1-6.5;Model 2:OR=2.7,95% CI 01.1-6.5) increased the risk of low birth weight.No significant difference was identified in newborn's low birth weight between maternal SHS exposure or not in the first or third trimester.
Conclusion There is no evidence suggesting an association between mother's SHS exposure during pregnancy and newborn's low birth weightgroup
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