Table 3.
Sensitivity, specificity, negative and positive predictive values of IOS and spirometry in COPD patients
| Variable | Cut Of Point | Sensitivity | 95% CI | Specificity | 95% CI | +LR | -LR | +PV | -PV |
|---|---|---|---|---|---|---|---|---|---|
| R5 | >0.53 | 58.93 | 45.0 - 71.9 | 89.53 | 81.1 - 95.1 | 5.63 | 0.46 | 78.6 | 77.0 |
| R20 | >0.39 | 41.07 | 28.1 - 55.0 | 82.35 | 72.6 - 89.8 | 2.33 | 0.72 | 60.5 | 68.0 |
| X5 | <=-0.16 | 76.79 | 63.6 - 87.0 | 81.61 | 71.9 - 89.1 | 4.18 | 0.28 | 72.9 | 84.5 |
LR: Positive likelihood ratio, -LR: Negative likelihood ratio, +PV: Positive predictive value, -PV: Negative predictive value.