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Table 2 Diagnostic characteristics of some CT findings in predicting positive RT-PCR

From: COVID-19 pandemic: CT chest in COVID-19 infection and prediction of patient’s ICU needs

Characteristics High probability Intermediate/high probability Low or more probability GGO Crazy paving Curvilinear opacity Vascular enlargement
Sensitivity 69.7% 81.8% 92.6% 85.9% 45.3% 26.5% 29.4%
Specificity 97.6% 88.9% 67.5% 88.9% 93.7% 96.8% 96.8%
DA 77.3% 83.7% 85.8% 86.7% 58.4% 45.5% 47.6%
YI 67.3% 70.7% 60.1% 74.8% 38.9% 23.3% 26.2%
PPV 98.8% 95.2% 88.5% 95.4% 95.1% 95.7% 96.2%
NPV 54.4% 64.4% 77.3% 70.0% 38.8% 32.8% 33.7%
LR+ 29.28 7.36 2.85 7.73 7.13 8.34 9.26
LR 0.31 0.21 0.11 0.16 0.58 0.76 0.73
LR 94.34 35.87 26.12 48.67 12.21 10.98 12.71
  1. YI Youden’s index, DA diagnostic accuracy, PPV positive predictive value, NPV negative predictive value, LR+ positive likelihood ratio, LR− negative likelihood ratio, LR diagnostic odd ratio