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Table 3 Characteristics of mothers and their children by maternal serum PCB quintile.

From: Decreased sex ratio following maternal exposure to polychlorinated biphenyls from contaminated Great Lakes sport-caught fish: a retrospective cohort study.

 

Quintile of serum PCB

 

1

2

3

4

5

Mothers, n

34

35

35

35

34

Children analyzed, n

34

35

35

35

34

Serum PCB (ng/mL)- nondetects imputed, geometric mean (range)

0.7 (0.5–0.9)

1.0 (0.9–1.1)

1.4 (1.1–1.7)

2.2 (1.7–3.0)

4.7 (3.0–12.1)

Serum PCB (ng/mL)- nondetects assigned 0, geometric mean (range)

0.5 (0–0.8)

0.8 (0.4–1.1)

1.1 (0.7–1.6)

2.1 (1.4–2.9)

4.6 (2.9–11.9)

Crude sex ratio

0.706

0.629

0.457

0.657

0.412

Year of child's birth, mean ± sd

1988 ± 5

1983 ± 7

1985 ± 7

1982 ± 6

1980 ± 6

Yrs between delivery and blood analysis, mean ± sd

6.2 ± 5.1

10.1 ± 6.8

8.9 ± 6.8

11.1 ± 6.1

13.6 ± 5.8

Father's age (yrs) at delivery, mean ± sd

31.2 ± 5.5

31.3 ± 5.0

33.9 ± 5.5

32.3 ± 6.9

30.6 ± 5.3

Mother's age (yrs) at delivery, mean ± sd

29.7 ± 4.9

29.2 ± 3.8

30.3 ± 4.9

29.4 ± 4.0

28.3 ± 4.6

Captains cohort, n (%)

16 (47.1)

30 (85.7)

29 (82.9)

34 (97.1)

33 (97.1)

Previous male child, n (%)

19 (55.9)

26 (74.3)

19 (54.3)

16 (45.7)

17 (50.0)

Parity of mother, n (%)

     

   1

7 (20.6)

13 (37.1)

12 (34.3)

9 (25.7)

7 (20.6)

   2

17 (50.0)

15 (42.9)

16 (45.7)

21 (60.0)

19 (55.9)

   >2

10 (29.4)

7 (20.0)

7 (20.0)

5 (14.3)

8 (23.5)