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Adjusted odds of preterm birth (<37 weeks) by quartile of maternal prenatal lead level, among all infants and stratified by infant sex. Data from 949 mother-child pairs in Project Viva. Adjusted for sample weight of blood, gestational age at blood draw, gestational weight gain, pre-pregnancy BMI, maternal race, maternal country of birth, 2nd trimester calcium intake, smoking in pregnancy, parity, maternal age and child sex.
