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Table 1 Age-adjusted (≤45, 46+ years) characteristics at premenopausal mammography among 998 control women without breast cancer according to tertiles of absolute dense area, absolute non-dense area, and percent dense area

From: Nondense mammographic area and risk of breast cancer

  Tertiles of absolute dense area in cm2
Characteristics 1 (< 42.5) 2 (< 79.3) 3 (< 300.1)
Number of controls 330 339 329
Age at mammography, years 48.7 47.3 45.8
Age at menarche, years 12.3 12.4 12.5
Family history of breast cancer, % 6.9 8.6 8.0
Nulliparous at the time of mammography, % 7.2 7.6 13.9
Number of children at mammography1 2.7 2.6 2.4
Age at first birth, years1 25.1 25.7 26.1
Body mass index at mammography, kg/m2 26.6 24.7 24.7
Alcohol use at mammography, g/day 4.1 5.5 4.6
Total area on mammogram, cm2 164 177 253
Absolute non-dense area on mammogram, cm2 139 117 131
  Tertiles of absolute non-dense area in cm2
Characteristics 1 (< 69.5) 2 (< 145.1) 3 (< 482.6)
Number of controls 330 339 329
Age at mammography, years 47.3 47.4 47.2
Age at menarche, years 12.5 12.5 12.2
Family history of breast cancer, % 6.6 8.6 7.3
Nulliparous at the time of mammography, % 11.7 8.3 8.8
Number of children at mammography1 2.5 2.6 2.6
Age at first birth, years1 25.6 25.8 25.5
Body mass index at mammography, kg/m2 22.4 24.6 28.7
Alcohol use at mammography, g/day 5.8 4.7 3.9
Total area on mammogram, cm2 105 181 304
Absolute dense area on mammogram, cm2 62 76 70
  Tertiles of percent dense area
Characteristics 1 (< 27.8) 2 (< 49.9) 3 (< 90.4)
Number of controls 330 339 329
Age at mammography, years 48.2 47.4 46.4
Age at menarche, years 12.1 12.5 12.6
Family history of breast cancer, % 6.5 9.2 7.2
Nulliparous at the time of mammography, % 7.1 9.3 12.5
Number of children at mammography1 2.8 2.6 2.4
Age at first birth, years1 25.0 26.2 25.7
Body mass index at mammography, kg/m2 28.5 24.5 22.7
Alcohol use at mammography, g/day 4.1 4.9 5.5
Total area on mammogram, cm2 238 194 156
Absolute dense area on mammogram, cm2 35 75 96
Absolute non-dense area on mammogram, cm2 203 119 59
  1. 1) Among parous women.