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Table 1 Distribution of potential risk factors for breast cancer according to serum T3 level

From: Prospectively measured triiodothyronine levels are positively associated with breast cancer risk in postmenopausal women

Factor T3 quartile
  1 2 3 4 All
  N = 494 N = 704 N = 456 N = 531 N = 2,185
  Column percent
(T3 levels in italics)
T3 (mIU/l) <1.50 1.60 to 1.80 1.90 to 2.00 2.1 to -4.30  
Age      
   <50 62.1 46.6 26.1 21.5 39.7
   >50 37.9 53.4 73.9 78.5 60.3
Premenstrual 60.3 44.2 28.7 23.2 39.5
Peri/postmenopausal 39.7 55.8 71.3 76.8 60.5
HRT in peri/postmenopausal 13.3 14.2 15.4 17.6 15.4
   missing - - 0.3 - 0.1
Nulliparity 18.2 17.0 13.2 19.6 17.1
   missing - - 0.4 0.8 0.3
OC-use 4.7 6.0 9.0 11.5 7.6
   missing - - 0.7 0.9 0.4
Menarche <12 years 15.2 13.4 9.6 11.9 12.6
   missing - 0.4 1.3 1.3 0.7
Smoking      
   never 43.5 47.7 47.6 47.1 46.6
   current 35.8 33.2 34.0 33.1 34.0
   ex 20.6 19.0 18.0 18.8 19.1
   missing - - 0.4 0.9 0.3
Alcohol consumption      
   nothing 14.2 14.1 13.2 19.0 15.1
   less than every week 55.3 60.7 62.5 60.1 59.7
   every week 30.6 25.1 23.9 19.4 24.7
   missing - 0.1 0.4 1.5 0.5
BMI      
   <20 14.8 10.1 7.9 7.5 10.1
   ≥20 <25 62.3 56.1 53.9 46.5 54.7
   ≥25 <30 17.0 26.1 27.9 30.5 25.5
   ≥30 5.9 7.7 10.3 15.4 9.7
Height      
   ≤ 160 24.1 28.8 28.9 36.5 29.7
   >160 ≤ 165 32.6 33.2 30.9 30.7 32.0
   >165 ≤ 170 26.7 24.9 25.0 22.0 24.6
   >170 16.6 13.1 15.1 10.7 13.7
Education      
   <12 years 53.0 53.6 62.5 64.2 57.9
   12 years 20.9 27.4 22.1 21.8 23.5
   >12 years 21.7 14.9 11.2 10.7 14.5
   Missing 4.5 4.1 4.2 3.2 4.0
Married 54.9 54.4 51.3 50.3 52.9
   missing 0.8 1.8 7.2 14.5 5.8
  1. Abbreviations: T3, triiodothyronine; HRT, hormone replacementtherapy; OC, oral contraceptives; BMI, body mass index.