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Table 2 Adjusted mean percent mammographic density by age, BMI, postmenopausal hormone use (MCBCS and SASBAC controls)a.

From: No evidence for association of inherited variation in genes involved in mitosis and percent mammographic density

Characteristic

Level

MCBCS

Controls

(n = 484)

SASBAC

Controls

(n = 726)

  

Mean

95% CI

Mean

95%CI

Age, years

40 to 49

23.6

18.3 to 28.9

8.2

-------

 

50 to 59

20.1

17.9 to 22.2

16.7

14.9 to 18.6

 

60 to 69

18.2

16.1 to 20.2

13.7

12.4 to 15.1

 

70+

16.4

14.0 to 18.8

12.0

9.5 to 14.5

Body mass index, kg/m2b

< 25

24.8

24.0 to 27.6

19.2

17.5 to 20.8

 

25 to 30

16.0

14.2 to 17.9

11.2

10.0 to 12.5

 

> 30

10.6

8.2 to 13.0

6.8

5.1 to 8.5

 

Unknown

15.9

10.2 to 21.5

10.5

3.9 to 17.2

Postmenopausal hormone usec

Current

21.9

19.8 to 24.0

19.6

16.4 to 22.7

 

Former

18.1

16.1 to 20.2

17.0

14.9 to 19.1

 

Never

15.6

13.4 to 17.9

11.7

10.6 to 12.8

 

Unknown

18.3

12.7 to 23.9

14.7

11.8 to 17.6

  1. aMayo Clinic Breast Cancer Study; Singapore and Sweden Breast Cancer Study.
  2. b Adjusted for age. cAdjusted for age and BMI.