Table 3. Comparison of results using the bacteriological test results as ‘gold standard’ for TB diagnosis.

	T-SPOT.TB	ELISpot-2351c	P-value
Sensitivity	98.2% (56/57)	61.4% (35/57)	0.000
Specificity	94.6% (88/93)	91.4% (85/93)	0.388
Youden index	0.928	0.528
Kappa value	0.916	0.554

Note: 57 TB patients were diagnosed positive and 93 were diagnosed negative with the ‘gold standard’.