Table 7.

Maternal-infant ratios of biomarker Mn concentrations

	Biomarker Mn Ratio, Maternal/infant
	All			Sirajdikhan			Pabna
Maternal Biomarker Mn	N	β (SE)	p-value	n	β (SE)	p-value	n	β (SE)	p-value
Toenail Mn, μg/g
≤3.66	66	ref	-	40	ref	-	26	ref	-
3.67-7.35	64	5.35 (8.5)	0.53	27	0.09 (17.0)	1.00	37	11.15 (7.5)	0.14
7.36-12.93	53	9.10 (9.0)	0.31	16	9.22 (20.2)	0.65	37	11.71 (7.5)	0.12
>12.93	75	11.98 (8.2)	0.15	18	33.71 (19.4)	0.09	57	8.07 (7.0)	0.25
p-value for linear trend			0.42			0.10			0.62
Hair Mn, μg/g
≤18.2	169	ref	-	64	ref	-	105	ref	-
18.3-30.8	173	4.37 (11.65)	0.71	58	4.44 (10.1)	0.66	115	4.37 (18.2)	0.81
30.9-48.3	169	21.16 (11.72)	0.07	76	14.94 (9.5)	0.12	93	26.15 (19.2)	0.17
>48.3	175	25.79 (11.65)	0.03	99	15.70 (8.9)	0.08	76	38.63 (20.3)	0.06
p-value for linear trend			0.06			0.22			0.08