Table 3.

Diagnostic performance of chest CT for COVID-19 infection with RT-PCR result as reference

	n (%)	Sensitivity	Specificity	PPV	NPV	Accuracy	P
Total	612 (100)	94.2	76.4	76.7	94.1	66.5	-
Age
<60 years	228 (37.3)	92.4	74.4	73.6	91.7	65.1	0.004
>60 years	384 (62.7)	94.8	77.7	77.3	95.2	67.7	0.001
Sex
Male	383 (62.5)	95.8	77.3	75.9	93.7	64.2	0.03
Female	229 (37.5)	95.4	76.7	76.1	95.1	67.5	0.007