Table 5. Cox proportional hazard model of the time to detection of M. tuberculosis bacilli on MGIT960 based on 344 patients at the Mubende referral hospital.

Variable	Level	Coefficients (95% CI)	Hazard Ratio (95% CI)	p-value
HIV status	Negative	–		–
	Positive	2.94 (1.54–5.59)	18.9 (4.66–267)	0.001
	Unknown	0.27 (0.11–0.59)	1.31 (1.12–1.80)	0.001
Tobacco usage	Non smokers	–		–
	Smokers	1.94 (1.19–3.17)	6.96 (3.29–23.8)	0.007
Alcohol usage	Non consumers	–		–
	Consumers	1.88 (1.10–3.20)	6.55 (3.00–24.5)	0.019