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Table 5 Bivariate study for high/low risk classification among scales

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

Percentage of total agreement; Kappa statistics (95% CI)
Scale   Wolfe Tabár BI-RADS Boyd
Wolfe % Agreement: 92.55%* 90.37% 75.22% 75.25%
  Kappa (95% CI): 0.851 (0.798-0.904)* 0.804 (0.785-0.823) 0.485 (0.460-0.510) 0.485 (0.460-0.511)
Tabár % Agreement: 90.37% 90.16%* 84.46% 84.49%
  Kappa (95% CI): 0.804 (0.785-0.823) 0.800 (0.739-0.861)* 0.638 (0.612-0.663) 0.638 (0.612-0.664)
BI-RAD % Agreement: 75.22% 84.46% 93.35% * 99.97%
  Kappa (95% CI): 0.485 (0.460-0.510) 0.638 (0.612-0.663) 0.815 (0.746-0.885)* 0.999 (0.998-1.000)
Boyd % Agreement: 75.25% 84.49% 99.97% 93.62%*
  Kappa (95% CI): 0.485 (0.460-0.511) 0.638 (0.612-0.664) 0.999 (0.998-1.000) 0.822 (0.754-0.891)*
  1. *Data drawn from intra-observer agreement study (sub-sample of 320 mammograms)