Table 4. Results of two IGRAs stratified by baseline interferon-γ responses in different groups.

Baseline IGRA result	QFT-GIT+/T-SPOT.TB + (n = 41)	QFT-GIT-/T-SPOT.TB+ (n = 29)	QFT-GIT+/T-SPOT.TB–(n = 4)
QFT-GIT (IU/mL)
< 0.35	0	29	0
0.35–0.70	5	0	4
0.71–1.00	6	0	0
1.01–2.99	15	0	0
> = 3.00	15	0	0
T.SPOT TB (number of spots)
<6	0	0	4
6–8	2	3	0
9–29	6	17	0
> = 30	33	9	0

IGRA, interferon gamma release assay; QFT-GIT, QuantiFERON-TB Gold In-Tube; +, positive; -, negative; I, indeterminate.