Mycobacterium tuberculosis ecology in Venezuela: epidemiologic correlates of common spoligotypes and a large clonal cluster defined by MIRU-VNTR-24

Table 3 Comparison of specimens whose cultures grew isolates with SIT 17 or SIT 53 for percentage that were positive for Acid Fast Bacilli by microscopy

	All	All w/o SIT 17	All SIT 17	CCS all	CCS w/o SIT 17	CCS SIT 17	CCS w/o SIT 53	CCS SIT 53
Total	1298	1054	244	572	457	115	543	29
% with data	48	48	50	53	53	51	52	69
Positive	463	366	97	178	136	42	168	10
Negative	164	139	25	125	108	17	115	10
% positive	74	72	80	59	56	71	59	50
		All:		CCS:		CCS:		CCS:
Comparison		17 vs non 17		17 vs non 17		53 vs non 53		17 vs 53
Odds ratio		OR= 1.47		OR= 1.96		OR= 1.46		OR= 2.44
		(0.91–2.43)		(1.06–3.7)		(0.57–3.7)		(0.84–7.11)
		P = 0.14		P = 0.04		P = 0.55		P = 0.14

Comparisons were made based on the patients with microscopy data. The percentage of specimens that were AFB positive was compared between those that grew strains with either spoligotype SIT 17 or SIT 53, and those from which strains with all other patterns were isolated. Comparisons were made for all specimens in the study, and separately, for those obtained in Caracas (CCS). Two by two table comparisons with odds ratios and Yates corrected two-tail chi square values were calculated using OpenEpi http://www.openepi.com. Statistically significant p values are shown in bold

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