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As more women become obese in their early childbearing years, it becomes increasingly important for obstetricians to understand the effects of obesity on pregnancy. In this study, data from the Swedish Medical Birth Registry were used to compare pregnancy complications and adverse perinatal outcomes between morbidly obese women (12,402 women with BMIs 35.1-40.0; 3386 with BMIs >40.0) and normal-weight women (526,038 with BMIs 19.8-26.0). Most of the women were white; analyses were restricted to women with singleton deliveries who did not have insulin-dependent diabetes.
After adjustments for age, parity, and smoking status, heavier women were at significantly increased risk for maternal and fetal morbidity than were normal-weight women. The …