Table 4.

CO-RADS interobserver comparison and performance

	κ (95% CI)	AUC vs. RT-PCR diagnosis
Interpreter 1	0.872 (0.813–0.927)	0.983 (0.961–0.997)
Interpreter 2	0.843 (0.775–0.904)	0.860 (0.809–0.91)
Interpreter 3	0.550 (0.464–0.637)	0.955 (0.921–0.983)
Interpreter 4	0.676 (0.588–0.752)	0.775 (0.708–0.837)
Overall	0.732 (0.692–0.769)*	0.893 (0.708–0.997)

The interobserver performance comparisons are demonstrated in this table. For each interpreter, the κ scores are compared with the AUC values, which are plotted against the reference standards defined by RT-PCR and clinical diagnoses.

CO-RADS, COVID-19 Reporting and Data System; CI, confidence interval; AUC, area under the curve; RT-PCR, reverse transcriptase polymerase chain reaction.

^*Fleiss κ.