Table 4. Logistic regression analysis of the association of positive results of QFT, IP-10, IL-2 and TST with potential risk factors relevant to Mtb infection in HHC group.

Risk factor	QFT		IP-10		IL-2		TST
	Adjusted OR (95%CI)	P-value	Adjusted OR (95%CI)	P-value	Adjusted OR(95%CI)	P-value	Adjusted OR (95%CI)	P-value
Sex, Male	1.2(0.4–3.3)	0.765	0.9(0.3–2.5)	0.794	3.2(1.0–10.0)	0.048	2.3(0.9–6.2)	0.1
Age ≥ median agea	1.0(0.9–1.05)	0.212	1.0(0.9–1.03)	0.842	1.04(1.0–1.07)	0.035	1.0(0.9–1.03)	0.999
BCG vaccination	0.6(0.2–2.2)	0.471	1.3(0.4–4.4)	0.684	0.4(0.1–1.7)	0.236	1.1(0.3–3.6)	0.886
Exposure ≥90 hours	4.5(1.0–22.5)	0.031	7.9(2.0–32.0)	0.003	4.8(1.0–24.1)	0.047	0.8(0.3–2.7)	0.824
Smear grade
++	4.1(0.8–21.8)	0.094	7.6(1.7–32.8)	0.007	3.2(0.6–17.6)	0.176	0.8(0.2–2.9)	0.811
+++	5.3(1.0–29.6)	0.058	8.5(1.8–40.5)	0.007	8.9(1.5–53.3)	0.02	0.8(0.2–3.3)	0.843

OR: odds ratio; 95%CI: 95% confidence interval.

^aMedian age: 41 years old, the median age calculated in HHC group.