Table 2.

Change in placenta arsenic concentration in relation to maternal and infant arsenic variables.

Arsenic Variable	% Increase in placental Arsenic (95% CI)	N	P
Biomarkers
Maternal urinarya, b (μg/L)	31.0 (15.4, 48.7)	431	<0.0001
Maternal toenail§ (μg/g)	13.2 (2.0, 25.7)	579	0.0196
Infant toenailc (μg/g)	18.9 (1.8, 38.8)	151	0.0293
Exposured
Household drinking water§ (μg/L)	2.1 (1.3, 3.9)	716	<0.0001

^aExcluding arsenobetaine

^bAdjusted for creatinine concentration (mg/dL)

^cAdjusted for parity

^dBased on a doubling of exposure

^§No factors appreciably altered the estimates (see text).