Table 2.

Contingency table of chest CT screening CO-RADS score according to COVID-19 status for patients with both chest CT and RT-PCR available at the time of the COVID-19 diagnosis

CO-RADS score	COVID-19 positive, n (%)	COVID-19 negative, n (%)
5	10 (100)	0 (0)
4	8 (57.1)	6 (42.9)
3	0 (0)	18 (100)
2	0 (0)	132 (100)
1	4 (2.9)	135 (97.1)

CO-RADS score	COVID-19 positive, n	COVID-19 negative, n	Total, n
4-5	18	6	24
1-3	4	285	289
Total	22	291	313

Abbreviations: CO-RADS, = COVID-2019 Reporting and Data System classification; CT = computed tomography.

The highest CO-RADS score for each patient was kept in case of multiple chest CT scans.