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Table 1 Inter-reader agreement of breast density according to BI-RADS classifications. Results of the experienced reader are presented in the columns, results of the inexperienced reader are presented in the rows

From: Density is in the eye of the beholder: visual versus semi-automated assessment of breast density on standard mammograms

Ā 

Experienced reader

BI-RADS 1

BI-RADS 2

BI-RADS 3

BI-RADS 4

Total

Inexperienced reader

BI-RADS 1

66 (33.0%)

2 (1.0%)

2 (1.0%)

0 (0.0%)

70 (35.0%)

BI-RADS 2

19 (9.5%)

36 (18.0%)

1 (0.5%)

0 (0.0%)

56 (28.0%)

BI-RADS 3

5 (2.5%)

38 (19.0%)

10 (5.0%)

0 (0.0%)

53 (26.5%)

BI-RADS 4

1 (0.5%)

3 (1.5%)

14 (7.0%)

3 (1.5%)

21 (10.5%)

Total

91 (45.5%)

79 (39.5%)

27 (13.5%)

3 (1.5%)

200 (100.0%)

  1. The overall weighted kappa was 0.521, a moderate value (95% confidence interval 0.446ā€“0.597)