TABLE 4.

Multivariate logistic regression for positive TST and IFN-γ assay results (n = 409)^a

Variable	TST			IFN-γ Interferon-gamma assay
	% Positive (n)	Crude OR (95% CI)	Adjusted OR (95% CI)	% Positive (n)	Crude OR (95% CI)	Adjusted OR (95% CI)
Age	NA	1.03 (0.99-1.06)	1.04 (1.01-1.08)*	NA	1.00 (0.96-1.04)	1.00 (0.96-1.05)
Gender
Female	27.0 (10)	1.00	1.00	9.1 (2)	1.00	1.00
Male	73.0 (27)	0.96 (0.45-2.04)	0.80 (0.33-1.92)	90.9 (20)	0.25 (0.06-1.07)	0.30 (0.07-1.38)
Ethnicity
Caucasian	10.8 (4)	1.00	1.00	9.1 (2)	1.00	1.00
African-American	56.8 (21)	4.87 (1.63-14.54)*	4.97 (1.58-15.68)*	50 (11)	4.86 (1.06-22.27)	5.57 (1.16-26.74)*
Hispanic	32.4 (12)	5.36 (1.67-17.16)*	1.38 (0.27-7.11)	40.9 (9)	7.85 (1.66-37.19)	5.12 (0.87-30.27)
Birth Country
United States	70.3 (26)	1.00	1.00	77.3 (17)	1.00	1.00
Other	29.7 (11)	5.20 (2.33-11.61)	20.20 (4.21-97.02)	22.7 (4)	3.06 (1.06-8.79)	2.86 (0.67-12.15)
Prior incarceration
No	8.1 (3)	1.00	1.00	9.1 (2)	1.00	1.00
Yes	91.9 (34)	2.27 (0.68-7.61)	6.20 (1.48-25.95)*	90.9 (20)	1.94 (0.44-8.53)	2.60 (0.54-12.50)
Known TB contactb
No	81.1 (30)	1.00	1.00	95.5 (21)	1.00	1.00
Yes	18.9 (7)	1.70 (0.70-4.09)	2.47 (0.90-6.84)	4.5 (1)	0.31 (0.04-2.38)	0.42 (0.05-3.49)
Lived in shelterc
No	83.8 (31)	1.00	1.00	86.4 (19)	1.00	1.00
Yes	16.2 (6)	0.74 (0.30-1.84)	0.65 (0.24-1.80)	13.6 (3)	0.61 (0.18-2.10)	0.81 (0.22-3.01)
Intravenous drug use
No	94.6 (35)	1.00	1.00	86.4 (19)	1.00	1.00
Yes	5.4 (2)	0.36 (0.08-1.54)	0.38 (0.08-1.87)	13.6 (3)	1.06 (0.30-3.73)	2.28 (0.55-9.43)

^a*, P < 0.05.

^bKnown history of contact with a tuberculosis case.

^cHistory of living in nursing homes, homeless shelters, drug rehabilitation centers, or “bunk houses.”