Table 3.

Net total absorbance (NTA) analysis using the sum of the optical density (OD) values with corresponding sensitivity and specificity values

Sample timing	NTA OD cutoff	Sensitivity (%)	Specificity (%)	AUROCC
Admission	1.0	81.8	54.9	0.68
	2.0	66.7	90.2	0.78
	3.0	66.7	99.0	0.83
	4.0	63.6	100	0.82
Convalescent	1.0	81.8	41.2	0.62
	2.0	72.7	73.5	0.73
	3.0	72.7	90.2	0.82
	4.0	72.7	96.1	0.84

AUROCC = area under the receiver operator characteristic curve.