TABLE 5.

Models of inactive TB versus CXR-normal adjusted for BCG vaccination status and place of birth^a

Antibody to	Category	Range	OR (CI), model 3	P (test for trend)
16-kDa Ag	Low	≤0.06	1.0 (Ref.)	<0.001
	Medium	0.07, 0.14	4.0 (1.9, 8.5)
	High	0.15, 3.60	11.7 (4.9, 34.0)
ESAT-6	Low	≤0.09	1.0 (Ref.)	0.001
	Medium	0.09-0.2	1.9 (0.8, 4.1)
	High	0.2-4.0	5.9 (2.0, 17.6)
FdxA	Low	≤0.11	1.0 (Ref.)	0.016
	Medium	0.11-0.19	1.5 (0.7, 3.2)
	High	0.19-1.95	2.8 (1.2, 6.4)

^aELISA results were trichotomized into the categories “low,” “medium,” and “high” according to the tertiles of the overall antibody distribution. Model 3 is based on backward elimination from antibodies found to be significant at an alpha of 0.003 (Table 3). OR, odds ratio; CI, confidence interval; Ref., reference range.