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Table 3 Group comparisons between outbreak and endemic cases of tuberculosis due to RFLP types 0.0142 and 0.0728 in Alberta First Nations communities, 1991–2013

From: Epidemiological and genomic determinants of tuberculosis outbreaks in First Nations communities in Canada

 

Two-group comparison (groups 1a and 2a) p values

Three-group comparison (groups 1a, 2a and 2b) p values

Four-group comparison (all groups) p values

Age of cases, years

0.2127*

0.2733*

0.0001*

Proportion of cases with cavitation on chest radiographs

0.559¶

0.0001¶

<0.0001¶

Mean number of total contacts per case

0.0369**

0.0001**

0.0001**

Mean number of close contacts per case

0.0522**

0.0126**

0.0001**

Mean number of child-age contacts per case

0.0239**

0.0202**

0.0004**

Mean number of new TST positive tests among contacts

0.0241**

0.0027**

0.0007**

Mean number of new TST conversions among contacts

0.0417**

0.0001**

0.0001**

Proportion of diagnoses made during cold season

0.265¶

0.35¶

<0.0001¶

Proportion of cases living on reserve

0.574¶

0.128¶

0.007¶

  1. RFLP restriction fragment-length polymorphism, TST tuberculin skin test
  2. *One-way ANOVA test
  3. **Kruskal–Wallis test (adjusted for ties)
  4. ¶Fisher’s exact test