Table 2.

Kappa coefficient, sensitivity and specificity of VP1uAT ELISA and VLP IgG ELISA with the neutralization assay as the gold standard.

	Qualitative VP1u Results		Qualitative VLP IgG Results
Qualitative Neutralization Results	Positive	Negative	Positive	Negative
Positive a	40	1	36	5
Negative	0	8	1	7
Kappa coefficient (95% CI)	0.93 (0.79, 1.00)		0.63 (0.36, 0.89)
Sensitivity (95% CI)	97.6% (87.1%, 99.9%)		87.8% (73.8%, 95.9%)
Specificity (95% CI)	100%		87.5% (47.4%, 99.7%)

^a Serum samples were obtained from patients 120 days after hospitalization for acute parvovirus B19 infection or from additional patients who were not experiencing aplastic crisis.