Skip to main content

Table 1 Distribution of established and potential risk factors for breast cancer in women with breast cancer and the rest of cohort

From: T3 levels in relation to prognostic factors in breast cancer: a population-based prospective cohort study

Factor CIS n = 21 Invasive n = 149 Rest of cohort* n = 2015 All n = 2185
  (column percent; mean (SD) in italics)
Age at baseline (years) 48.1(6.7) 49.9(6.5) 50.5(6.4) 50.4(6.4)
Age <50 57.1 43.6 39.2 39.7
Age >50 42.9 56.4 60.8 60.3
BMI (kg/m2) 25.1(5.8) 24.7(4.4) 24.2(4.1) 24.3(4.1)
BMI <20 9.5 7.4 10.3 10.1
BMI ≥20 < 25 52.4 51.7 55.0 54.7
BMI ≥25 < 30 23.8 29.5 25.2 25.5
BMI ≥30 14.3 11.4 9.5 9.7
Age at menarche     
<12 years 9.5 14.1 12.6 12.6
>12 years 90.5 84.6 86.7 86.6
Missing - 1.3 0.7 0.7
Oral contraceptives     
Yes 9.5 6.0 7.7 7.6
No 90.5 93.3 91.9 92.0
Missing - 0.7 0.3 0.4
Postmenopausal     
Yes 47.6 56.4 61.0 60.5
No 52.6 43.6 39.0 39.5
Children     
Yes 76.2 77.9 83.1 82.6
No 23.8 21.5 16.7 17.1
Missing - 0.7 0.2 0.3
HRT in postmenopausal     
Yes 10 11.9 15.7 15.4
No 90 88.1 84.2 84.5
Missing - - 0.1 0.1
Smoking status     
Never 42.9 51.7 46.3 46.6
Ex 23.8 20.1 19.0 19.1
Current 33.3 27.5 34.5 34.0
Missing - 0.7 0.3 0.3
Married     
Yes 42.9 60.4 52.4 52.9
No 47.6 31.5 42.0 41.3
Missing 9.5 8.1 5.6 5.8
Alcohol consumption     
None 9.5 20.8 14.7 15.1
Less than every week 57.1 53.7 60.2 59.7
Every week 33.3 24.8 24.6 24.7
Missing - 0.7 0.5 0.5
Education     
≤12 years 76.2 79.1 81.6 81.4
>12 years 23.8 16.9 14.4 14.6
Missing - 4.0 4.0 4.0
  1. *Including one case where information on CIS or invasive status was not known.
\