Table 1. Descriptive Statistics of Pb Exposure and Covariates from the Study Population.

	total
Exposure	N = 123
Second trimester Pb (μg/L) median (IQR)	25.9 (21.6)
Third trimester Pb (μg/L) median (IQR)	27.6 (25.7)
Covariates
Child sex	N = 123
Male n (%)	74 (60.2)
Female n (%)	49 (39.8)
Maternal SES in pregnancy
Lower n (%)	66 (53.6)
Medium n (%)	45 (36.6)
Higher n (%)	12 (9.8)
Maternal age at birth (years) mean (SE)	28.5 (0.5)
Maternal BMI in pregnancy (kg/m2) mean (SE)	27.2 (0.4)
Child age at gut microbial sample collection (years) mean (SE)	9.7 (0.7)