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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.