Table 4. Associations between selected subject characteristics and tuberculin skin test or QuantiFERON^®-TB Gold In-Tube test results.

		TST ≥ 15 mm		Positive QFT-GIT		TST ≥ 10 mma
Characteristic	N	n	aOR (95% CI)	n	aOR (95% CI)	n	aOR (95% CI)
Age b	787	23	1.2 (1.0–1.3)	14	Not retained	42	1.1 (1.0–1.2)
TB prevalence in country of birth
<20 cases per 100,000 pop.	713	6	1.0	9	1.0	16	1.0
20–100 cases per 100,000 pop.	23	3	14.4 (3.2–64.2)	1	3.6 (0.4–29.3)	5	12.4 (3.9–39.6)
>100 cases per 100,000 pop.	51	14	38.6 (13.7–109.0)	4	7.0 (2.1–23.5)	21	34.7 (15.2–79.2)
Reactivity to M. avium PPD
No	725	19	Not retained	12	Not retained	32	1.0
Yes	62	4		2		10	6.8 (2.6–17.5)

N = total number of recruits with completed test and determinate results; n = the number or recruits with positive test results; TST = tuberculin skin test; QFT-GIT = QuantiFERON^®-TB Gold In-Tube test; aOR (95% CI) = adjusted Odds Ratios (95% confidence intervals) with boldface font indicating statistically significant differences; TB = tuberculosis.

^a TST induration >10 mm includes reactions >15 mm;

^b Increase in odds for each year of age.