TABLE 1.

Combined data from study 1 comparing assay performances of three commercial serology tests and the cPass sVNT^a

Parameter	Value for IgG detection in study 1
	Nucleocapsid-coated plates		Spike (S1)-coated plates		RBD-coated plates		cPass sVNT
	Positive (n = 45)	Negative (n = 23)	Positive (n = 45)	Negative (n = 23)	Positive (n = 45)	Negative (n = 23)	Positive (n = 45)	Negative(n = 23)
No. of positive samples	28	1	34	0	43	3	39	0
No. of negative	17	22	11	23	2	20	6	23
Sensitivity (%)	62.22		75.56		95.56		86.67
Specificity (%)		95.65		100.00		86.96		100.00
Accuracy (%)	92.31		97.36		87.82		98.67
PPV (%)	61.39		100.00		44.87		100.00
NPV (%)	95.80		97.36		99.44		98.54

^aSee Fig. 2. Sensitivity, specificity, accuracy, positive predictive values (PPV), and negative predictive values (NPV) are shown. A prevalence of 10% was used for the calculations.