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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.