Table 4.
QuantiFERON-TB Gold (QFT-TB) results in the overall group of patients with a positive tuberculin skin test (≥ 6 mm) and in various TST subgroups
| TST | Positive QFT-TB | |
|---|---|---|
| Induration (mm) | No (% of total) | No (% of TST group) |
| ≥ 6 | 398 (82.7) | 127 (31.9) |
| 0-5 | 37 (7.7) | 1 (2.7)2 |
| 6-10 | 105 (21.8) | 11 (10.5) |
| 11-14 | 89 (18.5) | 19 (21.3) |
| ≥ 15 | 204 (42.4) | 97 (47.5)3 |
| No TST1 | 46 (9.6) | 20 (43.5) |
TST = tuberculin skin test. 1) Not tested due to previous strong response. 2) Previous tuberculosis, 3) p < 0.001 compared to the other TST groups.