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Table 2 Gender distribution of first live-born offspring, by maternal characteristics and exposure status.

From: Maternal exposure to polychlorinated biphenyls and the secondary sex ratio: an occupational cohort study

  

PCB Exposed

 

PCB Unexposed

 
  

Male child

N (%)

Female child

N (%)

Male child

N (%)

Female child

N (%)

  

750 (49.8)

756 (50.2)

543 (49.9)

546 (50.1)

Maternal Education

    
 

Grade school only

35 (52.2)

32 (47.8)

30 (45.5)

36 (54.6)

 

Some high school

167 (49.1)

173 (50.9)

120 (49.2)

124 (50.8)

 

High school graduate or GED

308 (51.3)

292 (48.7)

262 (49.6)

266 (50.4)

 

Some college or professional training

163 (45.0)

199 (55.0)

104 (51.2)

99 (48.8)

 

College degree or higher

70 (57.4)

52 (42.6)

24 (63.2)

14 (36.8)

Oral contraceptive use in year prior to conception

    
 

Yes

76 (54.3)

64 (45.7)

14 (53.9)

12 (46.2)

 

No

674 (49.3)

692 (50.7)

529 (49.8)

534 (50.2)

Maternal cigarette consumption prior to conception

    
 

Yes

295 (51.0)

283 (49.0)

188 (49.9)

189 (50.1)

 

No

455 (49.0)

473 (51.0)

355 (49.9)

357 (50.1)

Maternal race/Ethnicity

    
 

White, non-Hispanic

684 (50.0)

684 (50.0)

478 (49.4)

490 (50.6)

 

Other

66 (47.8)

72 (52.2)

65 (53.7)

56 (46.3)

Maternal age at conception

    
 

18 or younger

35 (54.7)

29 (45.3)

147 (57.9)

107 (42.1)

 

19-24

420 (47.7)

460 (52.3)

317(46.6)

363 (53.4)

 

25-29

189 (52.2)

173 (47.8)

65 (59.6)

44 (40.4)

 

30 or older

106 (53.0)

94 (47.0)

14 (30.4)

32 (69.6)

Maternal BMI at age 20

    
 

15.0 to < 18.5

112 (52.1)

103 (47.9)

75 (53.6)

65 (46.4)

 

18.5 to < 22.0

382 (50.7)

372 (49.3)

261 (48.2)

280 (51.8)

 

22.0 to < 25.0

135 (44.9)

166 (55.2)

100 (46.7)

114 (53.3)

 

25.0 to < 30.0

44 (50.0)

44 (50.0)

39 (59.1)

27 (40.9)

 

30.0+

18 (58.1)

13 (41.9)

7 (46.7)

8 (53.3)