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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.