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Table 2 Accuracy of RSNA different classifications 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 RSNA atypical to typical RSNA indeterminate to typical RSNA typical RSNA atypical to typical RSNA indeterminate to typical RSNA typical RSNA atypical to typical RSNA indeterminate to typical RSNA typical
Correct classification 61% 68% 69% 55% 61% 62% 56% 66% 66%
Misclassification 39% 32% 31% 45% 39% 38% 44% 34% 34%
Sensitivity 79% 65% 49% 74% 68% 47% 76% 68% 48%
Specificity 41% 71% 94% 34% 52% 80% 31% 63% 87%
FPR 59% 29% 6% 66% 48% 20% 69% 37% 13%
FNR 21% 35% 51% 26% 32% 53% 24% 32% 52%
Prevalence 54% 54% 54% 54% 54% 54% 54% 54% 54%
PPV 61% 73% 90% 57% 63% 74% 57% 69% 81%
NPV 62% 64% 61% 52% 58% 56% 53% 63% 58%
Positive likelihood ratio 1.33 2.28 7.97 1.11 1.41 2.35 1.11 1.87 3.66
Negative likelihood ratio 0.52 0.48 0.55 0.78 0.62 0.66 0.75 0.50 0.60
Relative risk 1.60 2.00 2.30 1.18 1.48 1.68 1.21 1.86 1.96
Odds ratio 2.55 4.71 14.5 1.43 2.28 3.56 1.48 3.76 6.10
  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