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. 2009 Oct 23;118(3):437–443. doi: 10.1289/ehp.0900731

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Estimated mean birth weight by maternal Hg tertile and GSTM1/GSTT1 genotypes. Least-square means were estimated in the generalized linear model, adjusting for gestational age, prepregnancy BMI, weight gain during pregnancy, maternal age, education, infant sex, and parity. The average Hg level during pregnancy was divided into tertiles, and genotype was classified by combination of GSTM1 and GSTT1 genotypes.