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Table 2
Results of sensitivity, specificity, PPV, and NPV of SPR array compared to ELISA assay results
Antigen number^a	Sensitivity (%)^b		Specificity (%)^b		PPV (%)^b		NPV (%)^b
	SPR	ELISA	SPR	ELISA	SPR	ELISA	SPR	ELISA

W06	79	10	96	100	96	100	82	52
W10	45	38	100	96	100	92	64	60
W14	59	24	100	96	100	88	70	55
W19	31	62	96	79	90	75	57	67
W28	86	34	93	96	93	91	87	59
W38	79	24	100	100	100	100	82	56
W64	69	17	100	93	100	71	76	53
W70	14	24	100	100	100	100	53	56
W85	76	28	96	96	96	89	79	56
Multi-Ag	100	90	89	57	91	68	100	84

^aA total of nine M. tuberculosis related antigens were used for the test. ^bResults shown were averages of three independent experiments. PPV, positive predictive value; NPV, negative predictive value; SPR, surface plasmon resonance; ELISA, enzyme-linked immunosorbent assay; Ag, antigen.
Hsieh et al. Nanoscale Research Letters 2012 7:180 doi:10.1186/1556-276X-7-180

Table 2