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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.