The SIT 17 patients also had lower mean ages when the comparisons were stratified for each of the three regions with the most isolates, but the differences did not quite reach statistical significance (Caracas 35 vs 38.4, p = 0.077; Carabobo 34.5 vs 39.8 p = 0.076; and Amazonas 30.6 vs 39.1, p = 0.056).
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Mycobacterium tuberculosis ecology in Venezuela: epidemiologic correlates of common spoligotypes and a large clonal cluster defined by MIRU-VNTR-24.
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0.0770
0.1400
The sentences
The difference was more marked when AFB positivity was compared between Caracas patients with SIT 17 and SIT 53, but still failed to reach statistical significance (OR = 2.44, p = 0.14).
In contrast, SIT 53 may be less virulent because patients with this spoligotype tended to be older and may have more AFB negative sputa, but the AFB trend did not reach statistical significance, and the older age, while reaching statistical significance, was based on only 21 SIT 53 patients and needs to be confirmed in subsequent studies.