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Table 1 Demographic, lifestyle and reproductive characteristics of breast cancer patients and controls

From: Perfluorinated compounds are related to breast cancer risk in greenlandic inuit: A case control study

Parameters

Cases

Controls

p value

 

N (n)

median

95% CI

Min-max

N (n)

median

95% CI

Min-max

 

Demographic and lifestyle factors

         

   Age (years)

31 (31)

50

46.1; 56.7

29.0-80.0

115 (115)

54

49.1; 53.5

18-66

0.34

≤ 50

17 (54.8%)

   

37 (32.2%)

    

51-55

3 (9.70%)

   

26 (22.6%)

    

56-59

3 (9.70%)

   

17 (14.8%)

    

≥ 60

8 (25.8%)

   

35 (30.4%)

    

   BMI (kg/m2)

31 (13)

26.9

24.0; 29.1

16.5-34.4

115 (115)

26.4

26.4;27.2

16.6-43.4

0.69

<25

4

23.5

16.0; 22.3

16.5-25.0

42

23.0

21.7;23.0

16.1-25.0

0.84

25-29

8

27.6

26.6; 28.9

25.8-29.6

42

27.6

26.9;27.8

25.1-19.9

0.46

> 30

1

34.4

-

-

31

33.2

33.1; 35.9

30.3-43.4

-

   n-3/n-6

31 (29)

0.5

0.4; 0.6

0.2-1.7

115 (115)

0.5

0.5; 0.7

0.1-2.2

0.31

   Serum cotinine (ng/ml)

31 (28)

11.6

33.3; 140.0

0-600.0

115 (96)

120

121.0; 188.0

0.0-799.0

0.052

   Smoking status

31 (26)

   

115 (115)

   

0.77

Never

5 (19.2%)

   

21 (18.3%)

    

Former

3(11.5%)

   

20 (17.4%)

    

Current

18 (69.2%)

   

74 (64.3%)

    

Reproductive factors

         

   Total number of full term pregnancies

31(16)

2.0

1.7; 2.8

1-4

115 (89)

3.0

3.2; 4.1

0.0-11.0

<0.0001

   Ever breastfed

31(17)

   

115 (85)

    

Yes (%)

15 (88.2%)

   

76 (89.4%)

   

0.89

   Menopausal status

31 (20)

   

115 (89)

    

Premenopausal (%)

11 (55.0%)

   

16 (18.0%)

   

0.001

Postmenopausal (%)

9 (45.0%)

   

73 (82.0%)

   

0.001

   Serum E2 (nmol/l)

31(24)*

0.09

0.09; 0.23

0.03-0.51

115(59)

0.07

0.05; 0.16

0.01-1.59

0.10

Premenopausal

8

0.24

0.12; 0.38

0.06-0.44

11

0.13

0.05; 0.55

0.03-1.59

 

Postmenopausal

8

0.07

0.01; 0.25

0.03-0.51

48

0.07

0.06; 0.08

0.01-0.17

 
  1. N: total number of subjects, n: number of subjects having information for the corresponding parameters.
  2. BMI: body mass index
  3. *: 24 cases had E2 data but for 8 no menopause status information was given.