Table 4. Positive and negative agreement for the detection of SARS-CoV-2 and influenza A/B between the three commercial kits.

Viruses		PowerChek	STANDARD M	Allplex
SARS-CoV-2
	PPA	90/97	93/97	93/97
		92.8 (85.9–96.5)	95.9 (89.9–98.4)	95.9 (89.9–98.4)
	NPA	201/201	201/201	201/201
		100.0 (98.1–100.0)	100.0 (98.1–100.0)	100.0 (98.1–100.0)
	Kappa	0.95 (0.91–0.99)	0.97 (0.94–1.00)	0.97 (0.94–1.00)
Influenza A
	PPA	71/71	71/71	71/71
		100.0 (94.9–100.0)	100.0 (94.9–100.0)	100.0 (94.9–100.0)
	NPA	332/332	331/332	331/332
		100.0 (98.9–100.0)	99.7 (98.3–100.0)	99.7 (98.3–100.0)
	Kappa	0.97 (0.93–1.00)	0.99 (0.98–1.00)	0.99 (0.98–1.00)
Influenza B
	PPA	50/50	50/50	50/50
		100.0 (92.9–100.0)	100.0 (92.9–100.0)	100.0 (92.9–100.0)
	NPA	353/353	353/353	353/353
		100.0 (98.9–100.0)	100.0 (98.9–100.0)	100.0 (98.9–100.0)
	Kappa	1.00 (1.00–1.00)	1.00 (1.00–1.00)	1.00 (1.00–1.00)

PPA and NPA were presented as % with 95% confidence intervals and Kappa with 95% confidence intervals.

SARS-CoV-2 = severe acute respiratory syndrome-coronavirus-2, PPA = positive percent agreement, NPA = negative percent agreement.