Table 1 Description of the study population

Maternal DDE (μg / L)

< 5

46

27.4

5 -< 15

89

53.0

15 -< 25

25

14.9

≥25

8

4.7

Maternal PCB (μg / L)

< 5

84

50.0

5 -< 15

66

39.3

15 -< 25

11

6.5

≥25

7

4.2

Parity

0

57

33.9

1

65

38.7

2

31

18.5

≥3

15

8.9

Gestational age (weeks)

< 37

5

3.0

37 -< 40

23

13.7

≥40

140

83.3

Maternal age (years)

15 – 24

41

24.4

25 – 29

70

41.7

30 and older

57

33.9

Maternal height (cm)

<155

14

8.3

155 -< 170

122

72.6

≥170

32

19.1

Maternal education

High school

71

42.3

College

44

26.2

College plus

53

31.5

Maternal smoking status during pregnancy

Yes

22

13.1

No

146

86.9

Child birth year

1968 – 1972

48

28.6

1973 – 1982

98

58.3

>1983

22

13.1