Table 1 Demographic details of the study cohort

Number of pregnant women

11

12

12

11

312

Gestational age (wks)

39.76 (1.1)

39.88 (1.0)

38.95 (1.5)

39.41 (1.6)

39.4 (1.5)

Maternal age at enrollment (yrs)

31.73 (4.3)

31.25 (4.5)

30.23 (5.5)

30.72 (3.0)

31.8 (4.8)

Number ever smoked during pregnancy

0 (0)^a

0 (0)^a

0 (0)^a

3 (27.3)^a

18 (5.8)^a

Infant birth weight (kg)

3.43 (0.6)

3.49 (0.4)

3.21 (0.6)

3.19 (0.4)

3.4 (0.5)

Total urinary arsenic (U-As, μg/L)

21.04 (25.6)^b

0.67 (0.3)^b

13.81 (8.9)^b

0.74 (0.2)^b

3.7 (4.1)^b