Table 3.

Contingency tables of RT-PCR results according to COVID-19 status

	COVID-19 positive	COVID-19 negative	Total
RT-PCR positive	24	0	24
RT-PCR negative	11	435	446
Total	35	435	470

Chest CT CO-RADS score 4-5	Estimate	95% confidence interval
Sensitivity	0.82	0.60-0.95
Specificity	0.98	0.96-0.99
Positive predictive value	0.75	0.53-0.90
Negative predictive value	0.99	0.96-1.00

RT-PCR	Estimate	95% confidence interval
Sensitivity	0.69	0.51-0.83
Specificity	1.00	0.99-1.00
Positive predictive value	1.00	0.86-1.00
Negative predictive value	0.98	0.96-0.99

Abbreviations: CO-RADS = COVID-2019 Reporting and Data System classification; CT = computed tomography; RT-PCR = reverse-transcription polymerase chain reaction.