Table 3B.

Comparison of QFT-GIT and T-SPOT Results for 650 HCWs after Excluding Indeterminate Cases Using Cut-offs of 0.35 IU/mL (QFT-GIT) and Eight Spots (T-SPOT) with the Exclusion of Borderline Zone.

		T-SPOT		Total
		Positive (≥8 spot)	Negative (≤7 spot)
QFT-GIT
	Positive (≥0.35 IU/mL)	11	8	19
	Negative (<0.35 IU/mL)	5	626	631
Total		16	634	650

The QFT-GIT result was considered positive if the interferon-gamma response in the TB antigen tube after subtracting the response in the Nil tube was ≥0.35 IU/mL, and the T-SPOT result was considered positive if (antigen panel A minus Nil) and/or (antigen panel B minus Nil) ≥8. The QFT-GIT result was considered negative if the interferon-gamma response in the TB antigen tube after subtracting the response in the Nil tube was <0.35 IU/mL, and the T-SPOT result was considered negative if (antigen panel A minus Nil) and/or (antigen panel B minus Nil) was ≤7