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Table 3 Agreement between the first and second measures using the BI-RADS classification

From: Evaluation of mammographic density patterns: reproducibility and concordance among scales

Number of mammograms classified in each category in the first and second measurements
  Second measure
First measure Almost entirely fat Scattered fibroglandular densities Heterogeneously dense Extremely dense Total
Almost entirely fat 147 13 0 0 160
Scattered fibroglandular densities 14 101 10 0 125
Heterogeneously dense 0 14 48 6 68
Extremely dense 0 0 3 19 22
Total 161 128 61 25 375
Kappa-statistic estimation
Agreement Kappa (95% CI) Weighted Kappa (95% CI) Kappa high/low risk (95% CI)  
Observed % Expected %     
84.00 33.04 0.761 (0.706-0.814) 0.904 (0.877-0.928) 0.815 (0.746-0.885)  
  1. Low risk categories:
  2. Almost entirely fat: 0-25%
  3. Scattered fibroglandular densities: > 25-50%
  4. High risk categories:
  5. Heterogeneously dense: > 50-75%
  6. Extremely dense: > 75%