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Table 6 Inter-reviewer agreement for CO-RADS and the RSNA chest CT classification system stratified according to different categories

From: Comparison of the CO-RADS and the RSNA chest CT classification system concerning sensitivity and reliability for the diagnosis of COVID-19 pneumonia

Rating category Kappa 95% CI
CO-RADS
 CO-RADS 1 0.930 (0.928 to 0.931)
 CO-RADS 2 0.303 (0.301 to0.305)
 CO-RADS 3  − 0.018 (− 0.020 to − 0.016)
 CO-RADS 4 0.464 (0.462 to 0.465)
 CO-RADS 5 0.888 (0.886 to 0.890)
 Overall 0.801 (0.800 to 0.803)
RSNA
 Negative 0.924 (0.922 to 0.926)
 Atypical 0.380 (0.378 to 0.382)
 Indeterminate 0.386 (0.384 to 0.388)
 Typical 0.841 (0.839 to 0.843)
 Overall 0.781 (0.780 to 0.782
  1. CO-RADS COVID-19 Reporting and Data System, RSNA radiological Society of North America, CT computed tomography, CI confidence interval