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| TST at 20–28 months of age (mm) | Number of individuals (% of total) | Number of individuals with scar (% within TST category) |
| 0 | 72 (84.7) | 67 (93.1) |
| 1 – 4.5 | 3 (3.5) | 2 (66.7) |
| 5 – 9.9 | 6 (7.1) | 5 (83.3) |
| ≥10 | 4 (4.7) | 4 (100) |
