Table 2. Positivity of QFT-IT, IP-10 and TST in active TB patients.

Category	Test	N	Pos	Neg	Indt	% Sens
Total number of subjects	QFT-IT	175	155	16	4	90.6
	IP-10	175	160	13	2	92.5
	TST	119	82	37	NA	68.9
Culture positives	QFT-IT	160	141	15	4	90.4
	IP-10	160	145	13	2	91.8
	TST	110	75	35	NA	68.2
Culture negative	QFT-IT	15	14	1	0	93.3
	IP-10	15	15	0	0	100
	TST	9	7	2	NA	77.8
Smear positive	QFT-IT	149	133	12	4	91.7
	IP-10	149	136	11	2	92.5
	TST	104	73	31	NA	70.2
Smear negative	QFT-IT	26	22	4	0	84.6
	IP-10	26	24	2	0	92.3
	TST	15	9	6	NA	60.0

10 mm cut-off point was used for TST.

N - Number of subjects.

QFT-IT - QuantiFERON-TB Gold.

IP-10 - Interferon gamma inducible protein-10.

TST - Tuberculin skin test.

Pos - Positive.

Neg - Negative.

Indt - Indeterminate.

% Sens - Percentage of sensitivity, calculated after excluding indeterminate results.