Table 7. Covariates associated with false-negative test results for SmokeScreen.

Covariate	Unadjusted model		Adjusted model†
	OR	95% CI	OR	95% CI
Male	0.48	0.19, 1.17	0.50	0.19, 1.27
Age, years	1.04	1.01, 1.07	1.04	1.00, 1.07
Foreign born (yes/no)	0.39	0.15, 1.03	0.44	0.14, 1.37
INH treatment (yes/no)	0.62	0.20, 1.91	8.43	1.16, 61.22
Vitamin B6 intake (yes/no)	0.59	0.07, 4.78	0.77	0.06, 9.91
Time interval from last INH dose, hours	0.83	0.65, 1.06	0.68	0.44, 1.05

^†Multivariate logistic regression model with sex, age, foreign-born, B6 intake, INH treatment, and time interval from last INH dose as covariates.

Footnote: age and time interval from last INH dose are continuous variables; B6 intake, isoniazid treatment and foreign born are dichotomous yes/no variables.