Table 2. Logistic regression analysis of the association of a positive interleukin (IL)-2 ELISpot assay, interferon (INF)-γ ELISpot assay and tuberculin skin test with potential explanatory factors for the presence of positive results in tests for the immunodiagnosis of tuberculosis.

Covariates	IL-2 ELISpot assay		INF-γ ELISpot assay		Tuberculin skin test
	Crude OR (95% CI)	Adjusted OR (95% CI)	Crude OR (95% CI)	Adjusted OR (95% CI)	Crude OR (95% CI)	Adjusted OR (95% CI)
Exposure ≥100 hours	2.5(0.3 23.0)p<0.001)	1.7(0.2 18.0)p = 0.6	40.8(6.9 240.3)p<0.001	27.9(4.2 183.5)p = 0.001	19.3(2.7 137.5)p = 0.003	8.5(0.9 81.6)p = 0.06
BCG vaccination	1.4(0.5 3.4)p = 0.51	1.2(0.4 3.2)p = 0.72	1.7(0.7 4.0)p = 0.21	1.36(0.4 4.4)p = 0.6	2.3(0.9 5.9)p = 0.07)	2.3(0.7 7.3)p = 0.15
Age, years	1.02(1.0 1.1)p = 0.3	1.02(1.0 1.1)p = 0.44	1.06(1.0 1.1)p = 0.008)	1.06(1.0 1.13)p = 0.07	1.05(1.0 1.1)p = 0.02	1.05(1.0 1.1)p = 0.05)
Sex, male	0.8(0.1 4.5)p = 0.8	0.8(0.1 4.5)p = 0.8	1.1(0.2 5.1)p = 0.9	0.8(0.1 4.8)p = 0.72	1.05(0.3 2.5)p = 0.29	0.37(0.1 4.05)p = 0.41

*OR, odds ratio; CI, confidence interval.; BCG, Bacillus Calmette-Guérin.