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Table 2 Distribution of potential risk factors for breast cancer according to serum T3 level

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

Factor    T3 quartile  
  1 2 3 All
  n = 682 n = 765 n = 738 n = 2185
  Column percent (T3 levels in italics)
T3 (mIU/l) <1.70 1.70-1.90 >1.90  
Age     
< 50 60.6 37.9 22.4 39.7
> 50 39.4 62.1 77.6 60.3
Education     
<12 years 55.1 55.9 62.5 57.9
12 years 20.8 26.9 22.4 23.5
>12 years 19.6 13.5 11.2 14.6
Missing 4.4 3.7 3.9 4.0
Married 56.7 51.8 50.4 52.9
Missing 0.7 3.8 12.6 5.8
Smoking     
Never 44.0 48.5 47.0 46.6
Current 35.3 33.3 33.3 34.0
Ex 20.7 18.0 18.8 19.1
Missing - 0.1 0.8 0.3
Alcohol consumption     
Nothing 13.5 14.0 17.8 15.1
Less than every week 56.9 60.9 61.0 59.7
Every week 29.5 25.0 20.1 24.7
Missing 0.1 0.1 1.2 0.5
Menarche < 12 years 14.4 12.7 11.0 12.6
Missing 0.1 0.7 1.4 0.7
OC-use 4.5 7.1 11.1 7.6
Missing - 0.1 0.9 0.4
Nulliparity 17.4 15.4 18.6 17.1
Missing - 0.1 0.7 0.3
Peri/postmenopausal 41.2 63.3 75.5 60.5
HRT in peri/postmenopausal 13.9 13.8 17.6 15.4
Missing - - 0.2 0.1
Height     
≤160 24.6 30.6 33.3 29.7
>160 ≤ 165 32.7 32.3 31.0 32.0
>165 ≤ 170 27.0 22.9 24.3 24.6
>170 15.7 14.2 11.4 13.7
BMI     
<20 13.8 8.5 8.3 10.1
≥20 < 25 62.2 55.0 47.6 54.7
≥25 < 30 18.3 27.7 29.8 25.5
≥30 5.7 8.8 14.4 9.7