Table 1.
Clinical and demographic characteristics of the study population.
| Groups | n | Age1 (SD) | Males (%) | TST (T0)2 | TST (T4 or T12)2 | Abnormal Chest X-ray | Symptoms of TB | Sputum-smear/(and/or) culture positive cases |
|---|---|---|---|---|---|---|---|---|
| Probability of LTBI | ||||||||
| G.I Very low | 12 | 38.3 (16.2) | 1 (8.3) | 0 | 0 | 0 | 0 | 0/0 |
| G.II Low/moderate | 24 | 40.1 (15.5) | 6 (25) | 0–4 | ND or ≥5 mm | 0 | 2 | 0/0 |
| G.III High | 48 | 41.9 (14.9) | 14 (29) | ≥5 | – | 6 | 12 | 0/0 |
| TB (days after treatment onset) | ||||||||
| G.IV 0–2 | 29 | 39.4 (14.9) | 14 (48) | – | – | 29 | 29 | 18/18 |
| G.V 3–6 | 12 | 43.6 (13.1) | 8 (67) | – | – | 12 | 12 | 10/6 |
| G.VI ≥ 7 | 4 | 47.5 (20.1) | 3 (75) | – | – | 2 | 4 | 4/03 |
| Total | 129 | 41.1 (14.9) | 46 (36) | – | – | 49 | 59 | – |
The recent close tuberculosis (TB) contacts (rCt) and pulmonary TB patients were stratified according to the probability of latent TB infection (LTBI), via tuberculin skin test (TST) response at enrollment (T0) and follow up (T4 or T12), or the time (days) relapsed between the anti-tuberculosis treatment onset and the blood collection for this study, respectively.
1Mean age and standard deviation (SD), in years. 2TST in millimeters; Follow up TST in the 4th or 12th consecutive month. 3At the time of diagnostic. ND, not done.