Table 2.

Test results and analysis of nasopharyngeal swab specimens with Ct values of PCR positivity less than 33.

n	Nasopharyngeal Swab Specimen
	Positive (PCR < 33)	PCR Negative	Total
AT Positive	99	1	100
AT Negative	1	243	244
Total	100	244	344
Sensitivity	99.00%
95% CI	97.28–99.64%
Specificity	99.59%
95% CI	98.18–99.91%
Accuracy	99.42%

AT: antigen test; CI: confidence interval.