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Table 1 Demographic characteristics of study participants

From: High mammographic density is associated with an increase in stromal collagen and immune cells within the mammary epithelium

Selected characteristics Number or mean
Age at surgery Mean 43 yr (range 31–59 yr)
BI-RADS category  
  4 11
  3 16
  2 10
  1 4
Risk factors  
  BRCA−, strong family history 9
  BRCA1+ 15
  BRCA2+ 13
  Past history of BC or DCIS 24
Menopausal status  
  Premenopausal 28
  Perimenopausal 5
  Postmenopausal 8
Parity  
  Parous 37
  Nulliparous 4
  1. BI-RADS score 1: predominantly fat, 2: scattered fibroglandular densities, 3: heterogeneously dense, 4: extremely dense.
  2. Abbreviations: BC breast cancer, BI-RADS Breast Imaging-Reporting and Data System, DCIS ductal carcinoma in situ, IDC invasive ductal carcinoma.