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Table 7 Intra-reviewer agreement for CO-RADS and the RSNA chest CT classification system stratified according to different categories and reviewers

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 Reviewer 1 Reviewer 2 Reviewer 3
CO-RADS
 CO-RADS 1 1.000 0.959 1.000
 CO-RADS 2  − 0.007  − 0.007 0.000
 CO-RADS 3  − 0.014  − 0.007  − 0.007
 CO-RADS 4 0.850 0.793 0.735
 CO-RADS 5 1.000 1.000 0.893
Overall 0.933 0.932 0.900
 RSNA
 Negative 0.915 0.959 1.000
 Atypical  − 0.007  − 0.007 0.000
 Indeterminate 0.850 1.000 0.704
 Typical 1.000 1.000 0.897
 Overall 0.932 0.966 0.904
  1. CO-RADS COVID-19 Reporting and Data System, RSNA radiological Society of North America, CT computed tomography, CI confidence interval