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

Egyptian Journal of Radiology and Nuclear Medicine

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

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