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Table 4 Interobserver preference agreement

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 1 Κ valuea
COVID-RADS CO-RADS
Observer 2 COVID-RADS 738 (74.5%) 10 (1%) 0.86 (0.69–0.95)
CO-RADS 40 (4%) 203 (20.5%) P < 0.001
Observer 3 COVID-RADS 716 (72.3%) 11 (1.1%) 0.80 (0.61–0.93)
CO-RADS 62 (6.3%) 202 (20.4%) P < 0.001
  Observer 2 Κ valuea
COVID-RADS CO-RADS
Observer 3 COVID-RADS 726 (73.3%) 1 (0.1%) 0.94 (0.79–0.99)
CO-RADS 22 (2.2%) 242 (24.4%) P < 0.001
  1. aFleiss Κ value and 95% CI (confidence interval)