| 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 |