TABLE 2.

Performance characteristics of EIAs in different patient groups

Characteristica	Valueb
	Ortho		Organon		Calypte
	Group A	Group B	Group A	Group B	Group A	Group B
Sensitivity (%)	100	100	NA	100	100	100
Specificity (%)	100	100	NA	97.3	95.1	98.7
NPV	1.0	1.0	NA	1.0	1.0	1.0
PPV	1.0	1.0	NA	0.25	0.96	0.4

^aSensitivity, true positives/(true positives + false negatives); specificity, true negatives/(true negatives + false positives); NPV, negative predictive value [true negatives/(true negatives + false negatives)]; PPV, positive predictive value [true positives/(true positives + false positives)].

^bNA, not applicable.