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Table 3 Percentage of mammographic density of the study subjects by categories of mammographic density based on the Breast Imaging Reporting and Data System (BIRADS) of the American College of Radiology

From: Mammographic density and inter-observer variability of pathologic evaluation of core biopsies among women with mammographic abnormalities

ACR category N Percent density
   Mean Median
Mostly fatty (ACR I) 58 3 1
Fibroglandular (ACR II) 282 11 8
Heterogeneously dense (ACR III) 283 33 31
Dense (ACR IV) 65 52 50
Missing evaluations 7 22 13
Overall 695 23 18