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Table 1 Baseline table for demographic and reproductive factors

From: Serum levels of environmental pollutants is a risk factor for breast cancer in Inuit: a case control study

Parameters

Cases

Controls

p-value

 

N (n)

median

mean

95% CI

N (n)

median

mean

95% CI

Demographic factors

Age (years)

77 (77)

52.0

53.8

50.7; 57.0

84 (84)

50.0

49.3

46.6; 51.9

0.039 a

 ≤50

34 (44.2%)

   

50 (59.5%)

   

0.183b

 51–55

11 (14.3%)

   

6 (7.1%)

   

 56–59

7 (9.1%)

   

8 (9.5%)

   

 ≥60

25 (32.5%)

   

20 (23.8%)

   

BMI (kg/m2)

77 (48)

26.3

25.8

24.6; 27.0

84 (75)

27.7

27.6

26.5; 28.7

0.041 a

 <25

18 (37.5%)

   

23 (37.5%)

   

0.128b

 25–30

24 (50.0%)

   

31 (41.3%)

   

 >30

6 (12.5%)

   

21 (28.8%)

   

Smoking status

77 (70)

   

84 (80)

    

 Never

6 (8.6%)

   

16 (20.0%)

   

0.132b

 Former

18 (25.7%)

   

20 (25.0%)

   

 Current

46 (65.7%)

   

44 (55.0%)

   

Plasma cotinine (ng/ml)

77 (74)

46.3

132.4

91.5; 173.3

84 (76)

40.5

117.4

84.3; 150.6

0.209a

Reproductive factors

Menopausal status

77 (66)

   

84 (75)

    

 Premenopausal

24 (36.4%)

   

24 (32.0%)

   

0.585b

 Postmenopausal

42 (63.6%)

   

51 (68.0%)

   

Full term pregnancies

77 (60)

3.0

3.0

2.4; 3.5

84 (67)

3.0

3.1

2.6; 3.6

0.799a

Breastfed

77 (52)

   

84 (68)

    

 Ever breastfed (Yes)

46 (88.5%)

   

59 (86.8%)

   

0.781b

  1. aIndependent samples t-test on ln-transformed variables; bPearson’s chi2-test; N total number of subjects; n number of subjects with information on the corresponding parameter; 95% CI: 95% confidence interval; p-value: significance testing between cases and controls; Bold text: significant finding; BMI: body mass index
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Environmental Health

ISSN: 1476-069X