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Table 3 Diagnostic accuracy value of ultra-low-dose CT scan findings compared to Low-dose chest CT in COVID-19 features (n = 167)

From: Agreement between low-dose and ultra-low-dose chest CT for the diagnosis of viral pneumonia imaging patterns during the COVID-19 pandemic

Ultra-low-dose chest CT Low-dose chest CT Sensitivity Specificity PPV NPV Accuracy Kappa (P value)
Present Absent
Ground-glass opacity Present 36 (21.6) 4 (2.4) 85.7 96.8 90.0 95.3 94.0 0.84 (< 0.001)
Absent 6 (3.6) 121 (72.5)      
Crazy paving Present 1 (0.6) 0 (0) 33.3 100 100 98.8 98.8 0.50 (< 0.001)
Absent 2 (1.2) 164 (98.2)      
Consolidation Present 23 (13.8) 2 (1.2) 88.5 98.6 93 97.9 97.0 0.88 (< 0.001)
Absent 3 (1.8) 139 (83.2)      
Reticulation Present 13 (7.8) 3 (1.8) 86.7 98.0 81.3 98.7 97.0 0.82 (< 0.001)
Absent 2 (1.2) 149 (89.2)      
Nodular infiltration Present 16 (88.9) 2 (11.1) 88.9 98.7 88.9 98.7 97.6 0.88 (< 0.001)
Absent 2 (1.3) 147 (98.7)      
  1. NPV negative predictive value, PPV positive predictive value