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Table 1 Summary characteristics at time of mammogram and by breast case status for the eight participating studies

From: Joint association of mammographic density adjusted for age and body mass index and polygenic risk score with breast cancer risk

Characteristic Category Cases
N = 3628
Controls
N = 5126
N % N %
Study type Population-based or cohort 2439 67.2 3895 76.0
  Hospital-based 1189 32.8 1231 24.0
Age (years) < 50 432 11.9 553 10.8
  50–59 1150 31.7 1462 28.5
  ≥ 60 2046 56.4 3111 60.7
Parity Nulliparous 431 12.1 582 11.5
  Parous 3141 87.9 4459 88.5
  Unknown 56   85  
Menopausal status Pre-menopausal 540 15.0 878 17.4
  Post-menopausal 3058 85.0 4194 82.6
  Unknown 30   54  
Postmenopausal HT use in post-menopausal women Ever 1737 59.6 2116 57.4
Never 1179 40.4 1568 42.6
Unknown 142   510  
BMI (kg/m2) < 25 1542 42.9 2095 41.3
  ≥ 25 2049 57.1 2982 58.7
  Unknown 37   49  
Family history breast cancer in first degree relatives No 2808 81.5 3944 85.1
Yes 637 18.5 688 14.9
Unknown 183   494  
  1. HT hormone therapy