Table 7 Performance analysis regarding TST or IGRA for the diagnosis of TBI, considering as reference the other test, in the absence of gold standard method
IGRA | TST | |
|---|---|---|
Positive Likelihood Ratio (CI95%) | 3.87 (2.81–5.34) | 3.04 (2.32–3.97) |
Negative Likelihood Ratio (CI95%) | 0.66 (0.59–0.73) | 0.51 (0.44–0.60) |
Positive Predictive Value (pos-test probability) of each test individually | 64% | 60% |
Pos-test probability if IGRA and TST are positive | 84% | |