. Author manuscript; available in PMC: 2016 May 1.

Published in final edited form as: J Expo Sci Environ Epidemiol. 2015 Aug 26;25(6):639–648. doi: 10.1038/jes.2015.45

Table 3.

Spearman correlations (95% CI) for As and Mn biomarkers

	Maternal Toenail V4	Maternal Hair V4	Infant Toenail V4	Infant Hair V4	Cord Blood V3

Arsenic
Water, V4	0.54¹ (0.48, 0.60) n=607	0.45¹ (0.39, 0.51) n=700	0.36¹ (0.25, 0.46) n=258	0.39¹ (0.32, 0.45) n=683	0.47¹ (0.41, 0.53) n=640
Maternal Toenail, V4	1.00 n= 610	0.68¹ (0.64, 0.72) n=602	0.52¹ (0.43, 0.60) n=258	0.64¹ (0.59, 0.68) n=585	0.55¹ (0.48, 0.60) n=546
Maternal Hair, V4	0.68¹ (0.64, 0.72) n=602	1.00 n=703	0.41¹ (0.30, 0.50) n=253	0.61¹ (0.56, 0.65) n=685	0.44¹ (0.38, 0.50) n=634
Cord Blood, V3	0.55¹ (0.48, 0.60) n=546	0.44¹ (0.38, 0.50) n=634	0.43¹ (0.32, 0.53) n=229	0.43¹ (0.36, 0.49) n=619	1.00 n=641
Manganese
Water, V4	0.17¹(0.09, 0.24) n=600	0.15¹ (0.08, 0.22) n=694	0.06 (−0.06, 0.18) n=255	0.04 (−0.04, 0.11) n=676	0.13² (0.05, 0.20) n=634
Maternal Toenail, V4	1.00 n=610	0.14²(0.06, 0.22) n=603	0.39¹ (0.28, 0.49) n=258	0.07 (−0.01, 0.15) n=585	0.14² (0.06, 0.22) n=546
Maternal Hair, V4	0.14² (0.06, 0.22) n=603	1.00 n=704	0.14³ (0.02, 0.26) n=253	0.21¹ (0.14, 0.28) n=686	−0.01 (−0.09, 0.07) n=635
Cord Blood, V3	0.14²(0.06, 0.22) n=546	−0.01 (−0.09, 0.07) n=635	0.14³ (0.01, 0.26) n=229	0.05 (−0.03, 0.13) n=619	1.00 n=641

p<0.0001

p=0.001

p<0.05

V3: birth, V4: 4^th visit at one month postpartum

Note: V3: Birth, V4: 1 month post-partum