Table 2.

Sensitivity and specificity of SARS-CoV-2-N-IgG ELISA with reference to the Colloidal gold antibody detection kit

	Colloidal gold antibody detection kit	r-SARS-CoV-2-N based IgG ELISA	Total
		Positive Negative
Positive	174	0	174
Negative	6	182	188
Total	180	182	362
Concordance a: 98.3%		Sensitivity b: 100%	Specificity c: 96.8%

χ² = 3.702, p > 0.05

The sensitivity and specificity of the SARS-CoV-2-N IgG ELISA compared to the Colloidal gold antibody detection kit

a) (The number of positive samples detected by both methods + the number of samples determined to be negative by both methods)/the total number × 100

b) True positive (true positive + false negative) ×100

c) True negative (true negative – false positive) × 100