Table 1.

The optimal cut-off value of SARS-CoV-2 Quant II using the SARS-CoV-2 NeutraLISA as a reference standard.

SARS-CoV-2 Quant II (BAU/mL)	NAb (% inhibition)		% Agreement	Kappa (95% CI)	p-value	Sensitivity (95% CI)	Specificity (95% CI)
	< 35	≥ 35	96.1	0.91 (0.86, 0.96)	< 0.001	0.96 (0.93, 0.98)	0.96 (0.90, 0.99)
< 83.9	93	8
≥ 83.9	4	200
	< 80	≥ 80	98.4	0.97 (0.94, 1)	< 0.001	0.99 (0.95, 1)	0.98 (0.94,1)
< 210.8	146	2
≥ 210.8	3	154
	< 85	≥ 85	99.3	0.99 (0.97, 1)	< 0.001	1.00 (0.98, 1)	0.99 (0.95, 1)
< 261.9	151	0
≥ 261.9	2	152
	< 90	≥ 90	99.3	0.99 (0.97, 1)	< 0.001	0.99 (0.95, 1)	1.00 (0.98, 1)
< 442.7	155	2
≥ 442.7	0	148
	< 95	≥ 95	99.7	0.99 (0.98, 1)	< 0.001	0.99 (0.96, 1)	1.00 (0.98, 1)
< 442.7	156	1
≥ 442.7	0	148