Re-analysis of IGRA results by age categories
| 0–2 years | 3–4 years | 5–16 years | |
| (N=70) | (N=110) | (N=343) | |
| T-SPOT.TB | |||
| Insufficient blood volume | 21 | 16 | 9 |
| Test failed | 9 | 16 | 32 |
| Indeterminate results | 1 | 0 | 7 |
| Total N (%) without interpretable result | 31 (44%) | 32 (29%) | 48 (14%) |
| QFT-GIT | |||
| Insufficient blood volume | 26 | 23 | 14 |
| Test failed | 0 | 0 | 0 |
| Indeterminate results | 7 | 16 | 47 |
| Total N (%) without interpretable result | 33 (47%) | 39 (35%) | 61 (18%) |