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Table 1 Characteristics of two postmenopausal control populations (MCBCSa, 2001-2005 and SASBACb, 1993-1995).

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

Characteristic

Level

MCBCSa

(n = 484)

SASBACb

(n = 726)

  

N

% or mean

N

% or mean

Age, years

40 to 49

26

5.4

1

0.1

 

50 to 59

157

32.4

237

32.6

 

60 to 69

176

36.4

363

50.0

 

70+

125

25.8

125

17.2

Body mass index, kg/m2

Mean (SD)

464

26.9 (5.3)

718

25.7 (4.1)

Postmenopausal hormone use

Current

153

31.6

95

13.1

 

Former

163

33.7

186

25.6

 

Never

136

28.1

362

49.9

 

Unknown

32

6.6

83

11.4

Percent Mammographic Density, (%)

Mean (SD)

484

18.6 (13.9)

726

14.4 (13.9)

Categories

0

30

6.2

45

6.2

 

1 to 9

116

24.0

324

44.6

 

10 to 24

201

41.5

225

31.0

 

25 to 49

125

25.8

111

15.3

 

50 to 74

11

2.3

21

2.9

 

75+

1

0.2

0

0

  1. aMayo Clinic Breast Cancer Study. bSingapore and Sweden Breast Cancer Study.