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Table 2 Diagnostic accuracy value of ultra-low-dose CT scan findings compared to low-dose chest CT

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

  Low-dose chest CT      Diagnostic accuracy (95%CI) Kappa (P value)
Present Absent Sensitivity (95%CI) Specificity (95%CI) PPV (95%CI) NPV (95%CI)
Ultra-low-dose chest CT
Present 44 (26.3) 2 (1.2) 100 (89.9–100) 98.4 (93.7–99.7) 95.7 (84–99.2) 100 (96.1–100) 98.8 (95.7–99.7) 0.83 (< 0.001)
Absent 0 121 (75.5)      
  1. NPV negative predictive value, PPV positive predictive value, CI confidence interval