. 2021 Feb 21;137:104781. doi: 10.1016/j.jcv.2021.104781

Table 1.

Diagnostic performance of the evaluated Ag-RDTs according to viral load.

	PCR positive			PCR negative			High viral load (Ct $\leq$ 25)			Low viral load (Ct>25)
No. samples	170			150			84			86
Ct values	25.2 (20.2–29.7)			–			20.2 (17.9–22.2)			29.7 (27.0–31.3)
	Positive samples	Sensitivity	p value	Positive samples	Specificity	p value	Positive samples	Sensitivity	p value	Positive samples	Sensitivity	p value
CerTest	91/170	53.5 (45.7–61.2)	0.001	0/150	100.0 (97.6–100.0)	1.000	79/84	94.0 (86.7–98.0)	0.500	12/86	14.0 (7.4–23.1)	0.004
Panbio	102/170	60.0 (52.2–67.4)	0.001	0/150	100.0 (97.6–100.0)	1.000	81/84	96.4 (89.9–99.3)	0.500	21/86	24.4 (15.8–34.9)	0.004

Statistics: values are expressed as absolute count (percentage) and median (interquartile range). Sensitivity and specificity results are expressed as percentage with 95 %CI. P-values were calculated by the McNemar’s test. Significant differences are shown in bold. Abbreviations: Ag-RDT: antigen rapid diagnostic test; Ct: cycle threshold; 95 %CI: 95 % confidence interval; p-value: level of significance.