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Table 2 Frequency distribution of volumetric density within Breast Imaging Reporting and Data System breast density categories

From: Combining quantitative and qualitative breast density measures to assess breast cancer risk

Dense breast volume,b ml Control subjects Cases
BI-RADS breast densitya BI-RADS breast densitya
a
n = 731
%
b
n = 1557
%
c
n = 1115
%
d
n = 283
%
a
n = 233
%
b
n = 668
%
c
n = 600
%
d
n = 219
%
Quartile 1: ≤ 35.9 30.5 28.0 15.2 9.9 26.2 24.4 9.7 5.9
Quartile 2: 36.0–50.0 32.1 28.5 19.3 15.2 30.0 27.7 17.3 9.1
Quartile 3: 50.1–70.0 27.5 26.3 26.3 20.8 29.6 26.9 25.7 23.7
Quartile 4: 70.1+ 9.8 17.2 39.3 54.1 14.2 21.0 47.3 61.2
  1. BI-RADS Breast Imaging Reporting and Data System
  2. aBI-RADS breast density: a = almost entirely fat, b = scattered fibroglandular densities, c = heterogeneously dense, d = extremely dense
  3. bMeasured with Volpara software