Table 3. QuantiFERON TB Gold in tube (QFT-IT) results as a function of the age.
| Total N | Suspect of active TB N (%) | LTBI screening N (%) | |||||
|---|---|---|---|---|---|---|---|
| 621 (100) | 140 (22.5) | 481 (77.4) | |||||
| active TB N (%) | dotTB N (%) | LTBI N (%) | Healthy N (%) | ||||
| Definitive | Probable | ||||||
| age classes | 621 (100) | 14 (10.0) | 5 (3.6) | 121 (86.4) | 38 (7.9) | 443 (92.1) | |
| 0–12 | negative | 39 (75.0) | 0 | 0 | 14 (11.6) | 0 | 25 (5.6) |
| positive | 4 (7.7) | 2 (14.2) | 1 (20.0) | 0 | 1 (2.7) | 0 | |
| indeterminate | 9 (13.7) | 1 (7.1) | 0 | 7 (5.8) | 0 | 1 (0.2) | |
| 13–24 | negative | 103 (88.0) | 0 | 0 | 14 (11.6) | 0 | 89 (20.0) |
| positive | 11 (9.4) | 6 (42.9) | 1 (20.0) | 0 | 4 (10.5) | 0 | |
| indeterminate | 3 (2.6) | 0 | 0 | 3 (2.5) | 0 | 0 | |
| 25–36 | negative | 67 (87.0) | 0 | 0 | 17 (14.0) | 0 | 50 (11.3) |
| positive | 6 (7.8) | 3 (21.4) | 2 (40.0) | 0 | 1 (2.7) | 0 | |
| indeterminate | 4 (5.2) | 0 | 1 (20.0) | 3 (2.5) | 0 | 0 | |
| 37–48 | negative | 53 (82.8) | - | - | 8 (6.7) | 0 | 45 (10.7) |
| positive | 7 (10.9) | - | - | 1 (0.8) | 6 (16.2) | 0 | |
| indeterminate | 4 (6.3) | - | - | 3 (2.5) | 0 | 1 (0.2) | |
| 49–60 | negative | 59 (86.8) | 0 | - | 11 (9.1) | 0 | 48 (10.8) |
| positive | 6 (8.8) | 1 (7.1) | - | 1 (0.8) | 4 (10.8) | 0 | |
| indeterminate | 3 (4.4) | 0 | - | 3 (2.5) | 0 | 0 | |
| >60 | negative | 215 (88.5) | 0 | - | 32 (26.4) | 0 | 183 (41.2) |
| positive | 25 (10.3) | 1 (7.1) | - | 2 (1.6) | 22 (5.9) | 0 | |
| indeterminate | 3 (1.2) | 0 | - | 2 (1.6) | 0 | 1 (0.2) | |
Footnotes: TB: tuberculosis; LTBI: latent tuberculosis infection; dotTb: Disease other than TB.