Table 2 Diagnostic validity by optimal cut-off points, in the present study and as defined by the authors of the instruments
STRATIFY Cut point = 1 | STRATIFY Cut point = 2 | DOWNTON Cut point = 2 | DOWNTON Cut point = 3 | |
|---|---|---|---|---|
Sensitivity | 47.6% | 41.0% | 66.7% | 58.0% |
Specificity | 85.0% | 84.0% | 55.3% | 54.0% |
PPV | 10.9% | 1.8% | 5.50% | 0.90% |
NPV | 97.7% | 99.5% | 97.7% | 99.5% |
LR+ | 3.18 | 2.6 | 1.49 | 1.28 |
LR- | 0.61 | 0.69 | 0.60 | 0.76 |