Table 4. Distribution of multidrug resistance patterns, by history of tuberculosis treatment.

Drug combination	Multidrug resistance		History of tuberculosis treatment				OR (95% CI)	p
			No previous treatment		Previous treatment
			(n = 211)		(n = 430)
	n	%	n	%	n	%
R+S	3	1.0	1	0.9	2	1.0	0.26 (0.0.8-0.78)	0.011
H+S	18	6.0	12	11.0	6	3.1	1.14 (0.08-32.04)	1.000
H+R	58	19.3	19	17.4	39	20.3	1.21 (0.63-2.32)	0.647
H+R+S	139	46.2	50	45.9	89	46.4	1.02 (0.62-1.68)	0.968
H+R+E	19	6.3	7	6.4	12	6.3	0.97 (0.34-2.83)	0.851
H+R+S+E	64	21.3	20	18.3	44	22.9	1.32 (0.71-2.49)	0.432
Total	301	100.0	109	100.0	192	100.0

^H: isoniazid

^R: rifampin

^S: streptomycin

^E: ethambutol