Table 2.

Diagnosis of Mtb infection by culture method and QFTGIT at various cut-off values of the level of INFγ (IU/ml) in HIV-seronegative study participants (n = 107)

		Culture method		Diagnostic performance
QFTGIT/cut-off value (IU/ml)		Number of positive	Number of negative	Sensitivity (%)	Specificity (%)
≥ 0.35*	Number of positive	20	48	64.5	36.8
	Number of negative	11	28
≥ 0.2	Number of positive	21	54	67.7	28.9
	Number of negative	10	22
≥ 0.1	Number of positive	24	58	77.4	23.7
	Number of negative	7	18

*Manufacturer's recommended cut-off value.