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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Acad Radiol. 2015 Sep 26;22(12):1477–1482. doi: 10.1016/j.acra.2015.08.015

Table 1.

Distribution of subjective breast density BIRADS ratings with average age in each of the density groups.

BIRADS† Number
of Cases		 Percentage Average
Age		 Standard
deviation
1 54 5.0% 43.8 ± 4.20
2 433 40.1% 42.1 ± 3.82
3 549 50.8% 41.9 ± 3.65
4 44 4.1% 40.7 ± 2.90
†

BIRADS: Breast Imaging-Reporting and Data System, 1= almost all fatty, 2= scattered, 3= heterogeneous, 4= extremely dense