Table 1 Characteristics for 1151 pregnant women enrolled in the New Hampshire Birth Cohort Study with at least one exposure measurement

Maternal age at enrollment

30.9 (4.9)

32.2

0.02

 White

1020 (98.8)

113 (95.0)

0.01

 Less than college

304 (32.9)

32 (32.4)

 College graduate

362 (39.2)

43 (43.4)

 Any post-graduate school

258 (27.9)

24 (24.2)

0.48

 Married

787 (85.2)

90 (90.9)

 Single, separated, divorced

137 (14.8)

9 (9.1)

0.28

Pre-pregnancy BMI*

25.7 (5.6)

28.2 (6.3)

<0.0001

Weight gain during pregnancy*

35.3 (14.5)

28.9 (16.3)

<0.0001

 Nulliparous

428 (41.5)

48 (40.3)

 1 to 2

530 (51.4)

61 (51.3)

 3+

74 (7.2)

10 (8.4)

0.53

 Ever smoked during pregnancy

61 (6.5)

4 (4.0)

0.67

 Exposed to secondhand smoke during pregnancy

131 (13.9)

14 (14.0)

0.77

 Well water arsenic (μg/L)

4.2 (13.2); range 0.001–189.3

4.1 (13.0); range 0.005–96.5

0.83

 Well water ≥10 μg/L MCL

81 (10.7)

7 (7.5)

0.48

 Urinary arsenic (μg/L)

5.8 (12.4); range 0.2–288.5

6.5 (15.5); range 0.6–157.3

0.10

 Toenail arsenic (μg/g)

0.1 (0.1); range 0.001–0.7

0.1 (0.1); range 0.009–0.7

0.50

 Glucose Intolerant

0

105

 Gestational diabetes

0

14