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Table 2 Age-adjusted (< 55, 55-59, 60-64, 65+ years) characteristics at postmenopausal mammography among 1,662 control women without breast cancer according to quintiles of absolute dense area, absolute non-dense area, and percent dense area

From: Nondense mammographic area and risk of breast cancer

  Quintiles of absolute dense area in cm2
Characteristics 1 (< 14.4) 2 (< 26.6) 3 (< 39.8) 4 (< 64.3) 5 (< 302.6)
Number of controls 333 332 333 332 332
Age at mammography, years 62.2 61.4 62.0 60.6 60.4
Age at menopause, years 49.2 49.5 49.8 49.0 49.0
Age at menarche, years 12.6 12.7 12.6 12.6 12.6
Family history of breast cancer, % 11.6 12.0 14.0 13.0 13.2
Nulliparous at the time of mammography, % 4.0 5.5 5.2 8.0 10.2
Number of children at mammography1 3.6 3.6 3.4 3.2 3.2
Age at first child, years1 25.1 25.1 25.2 25.4 25.4
Body mass index at mammography, kg/m2 28.2 26.2 25.4 25.1 25.5
Alcohol use at mammography, g/day 5.9 5.7 4.7 5.9 4.9
Current hormonal use, % 30.3 34.6 34.8 42.4 56.1
Total area on mammogram, cm2 169 169 182 216 268
Absolute non-dense area on mammogram, cm2 162 148 149 164 171
  Quintiles of absolute non-dense area in cm2
Characteristics 1 (< 76.2) 2 (< 115.6) 3 (< 163.9) 4 (< 231.4) 5 (< 538.8)
Number of controls 333 332 333 332 332
Age at mammography, years 60.7 60.4 61.6 62.1 61.9
Age at menopause, years 49.6 49.5 49.2 49.2 48.9
Age at menarche, years 12.8 12.6 12.6 12.5 12.4
Family history of breast cancer, % 12.1 14.2 11.8 13.0 12.6
Nulliparous at the time of mammography, % 8.3 8.4 5.3 5.1 6.4
Number of children at mammography1 3.4 3.5 3.4 3.4 3.3
Age at first child, years1 25.5 25.4 25.2 25.2 24.9
Body mass index at mammography, kg/m2 22.4 24.7 25.9 27.5 30.1
Alcohol use at mammography, g/day 6.9 6.0 5.6 5.2 3.2
Current hormonal use, % 47.6 39.9 33.8 38.6 36.1
Total area on mammogram, cm2 93 135 179 241 355
Absolute dense area on mammogram, cm2 41 39 40 45 46
  Quintiles of percent dense area
Characteristics 1 (< 8.1) 2 (< 15.7) 3 (< 24.1) 4 (< 37.1) 5 (< 86.5)
Number of controls 334 331 333 332 332
Age at mammography, years 62.2 62.0 61.8 60.8 59.7
Age at menopause, years 49.1 49.7 49.3 49.1 49.0
Age at menarche, years 12.6 12.5 12.5 12.7 12.8
Family history of breast cancer, % 10.7 14.3 12.0 12.8 13.9
Nulliparous at the time of mammography, % 6.2 2.7 5.5 8.0 11.4
Number of children at mammography1 3.6 3.5 3.4 3.2 3.1
Age at first child, years1 25.2 24.8 25.1 25.4 25.8
Body mass index at mammography, kg/m2 29.9 26.9 25.7 24.4 23.4
Alcohol use at mammography, g/day 5.2 4.3 5.4 6.0 6.1
Current hormonal use, % 27.1 32.7 36.4 47.3 54.1
Total area on mammogram, cm2 231 223 210 182 154
Absolute dense area on mammogram, cm2 10 27 41 55 76
Non-dense breast area on mammogram, cm2 221 196 169 127 78
  1. 1) Among parous women.