Table 2. Adjusted analysis of factors associated with initial isoniazid resistance in tuberculosis disease, United States, 1993–2005*.

Characteristic	Adjusted OR (95% CI)	p value
Foreign-born	2.25 (1.47–3.43)	<0.01
Age category, y		0.10
<1	0.22 (0.03–1.70)
1–<4	0.52 (0.17–1.57)
4–<14	0.60 (0.17–2.06)
14 –<24	0.53 (0.24–1.21)
24–<34	Reference
34– <44	0.80 (0.46–1.37)
44–<54	0.54 (0.28–1.06)
54 <64	0.60 (0.29–1.24)
64–74	0.28 (0.11–0.74)
>74	0.22 (0.07–0.74)

*OR, odds ratio; CI, confidence interval.