Table 4.

Age stratification analysis

Age	Percentage of positivity
	TST		QFT-IT		IP-10
	HC	HHC	HC	HHC	HC	HHC
≤17 years	1.2#	37.3	2.3#	50.5	2.3#	62.7*
18–30 years	20.5	55.8	24.1	64.7	33.3	70.6
31–45 years	28.6	66.7	31.3	68.1	40.0	80.9
>45 years	33.3	46.2	90*	89.5*	93.0*	84.2*

The difference between the positivity of tests was calculated using Fisher’s exact test. The cut-off point of 10mm was used for tuberculin skin test.

^*represents significantly higher when compared to TST.

^#represents significantly lower compared to subjects >17 years. A p value of <0.05 is considered significant.

QFT-IT - QuantiFERON TB Gold (In-tube),

TST - Tuberculin Skin test

N - Number of subjects

NS - Not significant