| Group 1a (n = 2) | Group 1b (n = 27) | Group 2a (n = 15) | Group 2b (n = 31) |
---|---|---|---|---|
Age, years | ||||
 Mean (standard deviation) | 25 (4.2) | 21.4 (15.9) | 37.7 (13.4) | 44.4 (21.9) |
 Median | 25 | 21 | 44 | 40 |
 Minimum to maximum | 22–28 | 0–59 | 18–56 | 1–92 |
Percentage of cases with cavitation on chest radiograph | 100 | 0 | 57.1# | 3.3 |
Number of total contacts per case | ||||
 Mean | 811.5§ | 3.2 | 106 | 18.5 |
 Median | 811.5 | 0 | 51 | 6 |
 Minimum to maximum | 488–1135 | 0–34 | 10–672 | 0–189 |
 75% –25% interquartile range | 647 | 1 | 79 | 9 |
Number of close contacts per case | ||||
 Mean | 72§ | 1.9 | 47.7 | 9.4 |
 Median | 72 | 0 | 17 | 5 |
 Minimum to maximum | 69–75 | 0–18 | 0–465 | 0–80 |
 75% – 25% interquartile range | 6 | 0 | 29 | 10 |
Number of child-age†contacts per case | ||||
 Mean | 27 | 0.7 | 3.9 | 2.2 |
 Median | 27 | 0 | 2 | 1 |
 Minimum to maximum | 26–28 | 0–8 | 0–23 | 0–17 |
 75% – 25% interquartile range | 2 | 0 | 5 | 3 |
Number of new TST positive tests among contacts | ||||
 Mean | 15.5 | 0.2 | 1.8 | 0.3 |
 Median | 15.5 | 0 | 1 | 0 |
 Minimum to maximum | 13–18 | 0–2 | 0–13 | 0–2 |
 75% – 25% interquartile range | 5 | 0 | 2 | 0 |
Number of TST conversions among contacts | ||||
 Mean | 14.5 | 0.1 | 1.9 | 0.3 |
 Median | 14.5 | 0 | 1 | 0 |
 Minimum to maximum | 12–17 | 0–2 | 0–20 | 0–1 |
 75% – 25% interquartile range | 5 | 0 | 1 | 0 |
Percentage of diagnoses made during cold season | 100 | 92.5 | 46.7 | 38.7 |
Percentage of cases living on reserve | 100 | 25.9 | 73.3 | 48.4 |