Table 1. Characteristics of the patients included or excluded from the study among the 2573 enrolled patients.

	Included patients		Excluded patients		p value
	N	% distribution	N	% distribution
Total	2207		366
Year of inclusion
2003	427	19.3	82	22.4	0.167
2004	638	28.9	103	28.1	0.764
2005	573	26.0	91	24.9	0.643
2006	569	25.8	90	24.6	0.629
District of residence
Cai Be	662	30.0	103	28.1	0.472
Cai Lay	910	41.2	152	41.5	0.902
Chau Thanh	635	28.8	111	30.3	0.555
Age (years)
<25	182	8.2	19	5.2	0.046
25–34	286	13.0	32	8.7	0.022
35–44	455	20.6	65	17.8	0.208
45–54	454	20.6	60	16.4	0.615
55–64	246	11.1	47	12.8	0.331
65+	584	26.5	143	39.1	<0.001
Sex
Male	1654	74.9	249	68.0	0.006
Female	553	25.1	117	32.0
History of TB treatment
New	1987	90.0	316	86.3	0.035
Previously treated	220	10.0	50	13.7