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Table 3 Interobserver reliability and performance

From: Validation of imaging reporting and data system of coronavirus disease 2019 lexicons CO-RADS and COVID-RADS with radiologists’ preference: a multicentric study

Observer no. Κ valuea AUCb vs. RT-PCR AUC vs. clinical suspicion index
COVID-RADS
 Observer 1 0.89 (0.84–0.98) 0.94 (0.87–0.98) 0.95 (0.93–0.99)
 Observer 2 0.78 (0.84–0.92) 0.91 (0.78–0.97) 0.91 (0.85–0.98)
 Observer 3 0.75 (0.84–0.87) 0.89 (0.74–0.95) 0.90 (0.84–0.97)
 Overall 0.82 (0.84–0.91) 0.92 (0.85–0.96) 0.93 (0.87–0.99)
CO-RADS
 Observer 1 0.86 (0.64–0.97) 0.88 (0.81–0.97) 0.93 (0.88–0.99)
 Observer 2 0.91 (0.77–0.99) 0.84 (0.79–0.93) 0.92 (0.87–0.98)
 Observer 3 0.91 (0.77–0.99) 0.81 (0.75–0.92) 0.89 (0.82–0.96)
 Overall 0.78 (0.59–0.91) 0.85 (0.76–0.94) 0.94 (0.90–0.99)
  1. aFleiss Κ value and 95% CI (confidence interval)
  2. bAUC (area under the curve)