| 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¶ |