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Table 4 Agreement between the first and second measures using the Boyd 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 A B C D E F Total
A = 0% 6 4 0 0 0 0 10
B = > 0-10*% 4 56 11 0 0 0 71
C = 10-25*% 0 16 50 13 0 0 79
D = 25-50*% 0 0 14 102 9 0 125
E = 50-75*% 0 0 0 14 48 6 68
F =75% 0 0 0 0 3 19 22
Total 10 76 75 129 60 25 375
Kappa-statistic estimation
Agreement Kappa (95% CI) Weighted Kappa (95% CI) Kappa high/low risk (95% CI)
Observed % Expected %       
74.93 22.88 0.675 (0.616-0.733) 0.917 (0.898-0.933) 0.822 (0.754-0.891)
  1. Low risk categories:
  2. A: 0%
  3. B: > 0-10*%
  4. C: 10-25*%
  5. D: 25-50*%
  6. High risk categories:
  7. E: 50-75*%
  8. F: ≥75%
  9. *Upper bound excluded