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Table 4 Accuracy of different CO-RADS classes for diagnosis of COVID-19 as calculated for each of the three raters

From: Comparison of the RSNA chest CT classification system and CO-RADS system in reporting COVID-19 pneumonia in symptomatic and asymptomatic patients

  Rater 1 Rater 2 Rater 3
  95% CI 95% CI 95% CI
Statistic CO-RADS 2–5 CO-RADS 3–5 CO-RADS 4–5 CO-RADS 5 CO-RADS 2–5 CO-RADS 3–5 CO-RADS 4–5 CO-RADS 5 CO-RADS 2–5 CO-RADS 3–5 CO-RADS 4–5 CO-RADS 5
Correct classification 61% 68% 70% 64% 55% 61% 62% 62% 57% 65% 66% 64%
Misclassification 39% 32% 30% 36% 45% 39% 38% 38% 43% 35% 34% 36%
Sensitivity 76% 65% 51% 38% 74% 68% 59% 47% 76% 68% 62% 49%
Specificity 42% 71% 91% 96% 34% 52% 66% 80% 34% 62% 71% 82%
FPR 58% 29% 9% 4% 66% 48% 34% 20% 66% 38% 29% 18%
FNR 24% 35% 49% 63% 26% 32% 41% 53% 24% 32% 38% 51%
Prevalence 54% 54% 54% 54% 54% 54% 54% 54% 54% 54% 54% 54%
PPV 61% 73% 88% 91% 57% 63% 67% 74% 58% 68% 72% 76%
NPV 60% 64% 61% 56% 52% 58% 58% 56% 55% 62% 61% 57%
Positive likelihood ratio 1.31 2.28 5.92 8.63 1.11 1.41 1.73 2.35 1.16 1.79 2.15 2.66
Negative likelihood ratio 0.56 0.48 0.53 0.65 0.78 0.62 0.62 0.66 0.69 0.51 0.54 0.63
Relative risk 1.52 2.00 2.27 2.09 1.18 1.48 1.58 1.68 1.28 1.80 1.85 1.78
Odds ratio 2.33 4.71 11.14 13.20 1.43 2.28 2.78 3.56 1.67 3.49 4.01 4.22
  1. Data in cross-tables are counts.95% CI = 95% confidence interval.
  2. FPR False-positive rate, FNR False-negative rate, PPV Positive predictive value, NPV Negative predictive value