Table 2 Diagnosis of Mtb infection by culture method and QFTGIT at various cut-off values of the level of INFγ (IU/ml) in HIV-seronegative study participants (n = 107)
| Â | Â | Culture method | Diagnostic performance | ||
|---|---|---|---|---|---|
QFTGIT/cut-off value (IU/ml) | Â | Number of positive | Number of negative | Sensitivity (%) | Specificity (%) |
≥ 0.35* | Number of positive | 20 | 48 | 64.5 | 36.8 |
| Â | Number of negative | 11 | 28 | Â | Â |
≥ 0.2 | Number of positive | 21 | 54 | 67.7 | 28.9 |
| Â | Number of negative | 10 | 22 | Â | Â |
≥ 0.1 | Number of positive | 24 | 58 | 77.4 | 23.7 |
| Â | Number of negative | 7 | 18 | Â | Â |