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Table 1 Characteristics of the study participants overall and with mammograms classified as high-risk density patterns

From: Percentage density, Wolfe's and Tabár's mammographic patterns: agreement and association with risk factors for breast cancer

Characteristic All women Quantitative Reader GM Reader GU/GM Reader GU Pattern Reader NB  
  n = 987 Upper quartile ≥ 28.3% (n = 249) Upper quartile ≥ 21.0% (n = 246) Upper quartile ≥ 19.0% (n = 247) Wolfe P2, DY (n = 462) Tabár IV, V (n = 233)
Age (years) at screening, mean ± SD 61.4 ± 4.5 60.4 ± 4.4 60.3 ± 4.5 60.3 ± 4.5 60.8 ± 4.6 60.6 ± 4.5
Age (years) at menarche, mean ± SD 13.3 ± 1.4 13.4 ± 1.3 13.4 ± 1.3 13.4 ± 1.3 13.3 ± 1.3 13.4 ± 1.3
Age (years) at menopause, mean ± SD 48.5 ± 5.1 48.5 ± 4.9 48.8 ± 4.8 48.8 ± 4.7 48.8 ± 4.9 48.7 ± 4.8
Parous (%) 92.6 89.2 88.6 87.5 89.4 88.0
Age (years) at first birth/pregnancy, mean ± SD 22.9 ± 3.7 23.9 ± 4.3 24.1 ± 4.3 24.1 ± 4.3 23.4 ± 3.9 23.9 ± 4.4
Number of children, mean ± SD 2.6 ± 1.4 2.1 ± 1.2 2.1 ± 1.1 2.0 ± 1.2 2.3 ± 1.3 2.1 ± 1.2
Body mass index, mean ± SD 27.4 ± 4.8 24.9 ± 3.6 25.1 ± 3.7 25.1 ± 3.8 26.0 ± 4.0 25.9 ± 3.8
Wolfe high-risk patterns (P2, DY) (%) 46.8 95.6 96.3 96.4 - 99.1
Tabár high-risk patterns (IV, V) (%) 23.6 60.6 66.3 67.2 50 -
Reader GM       
   Median density, % (range) 14.5 (0–88.4) - 41.1 (9.4–88.4) 39.4 (7.6–88.4) 28.6 (1.9–88.4) 34.9 (1.9–88.4)
Reader GU       
   Median density, % (range) 9.6 (0–69.2) 26.6 (0.6–69.2) 27.7 (0.6–69.2) - 19.4 (0.6–69.2) 25.2 (3.5–69.2)
Readers GU and GM       
   Median density, % (range)   29.5 (3.9–73.8) - 30.5 (18.4–73.8) 21.7 (2.1–73.8) 28.1 (3.6–73.8)
  1. For percentage mammographic densities, the upper quartile is defined as high-risk and the lower three quartiles as low-risk.