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Table 2 Agreement between the first and second measures using the Tabár 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 II III IV V Total
II 12 9 0 0 21
III 4 170 16 8 198
IV 0 4 114 6 124
V 0 8 9 15 32
Total 16 191 139 29 375
Kappa-statistic estimation
Agreement Kappa (95% CI) Weighted Kappa (95% CI) Kappa high/low risk (95% CI)  
Observed % Expected %     
82.93 40.05 0.715 (0.649-0.772) 0.707 (0.623-0.781) 0.800 (0.739-0.861)  
  1. Low risk categories:
  2. I: Mammogram composed of scalloped contours with some lucent areas of fatty replacement and 1 mm evenly distributed nodular densities.
  3. II: Mammogram composed almost entirely of lucent areas of fatty replacement and 1-mm evenly distributed nodular densities.
  4. III: Prominent ducts in the retroareolar area.
  5. High risk categories:
  6. IV: Extensive, nodular and linear densities with nodular size larger than normal lobules.
  7. V: Homogeneous ground-glass-like appearance with no perceptible features.