Table 3.
The findings of the ROC analysis with sensitivity, specificity, positive–negative predictive and positive likelihood ratio values demonstrating the success of the Prognostic Nutrition Index (PNI) and albumin in amputation prediction.
| Prognostic Nutritional Index (PNI) | Albumin | |
|---|---|---|
| AUC (95% CI) | 0.937 (0.911–0.963) | 0.938 (0.912–0.964) |
| p values | <0.001 | <0.001 |
| Cut off | ≤39.005 | ≤38.5 |
| Sensitivity (95% CI) | 82.7% (74.1–89) | 81.8% (73.1–88.3) |
| Specificity (95% CI) | 93.1% (89.3–95.7) | 93.1% (89.3–95.7) |
| PPV (95% CI) | 82.7% (74.1–89) | 82.6% (73.9–88.9) |
| NPV (95% CI) | 93.1% (89.3–95.7) | 92.8% (88.9–95.4) |
| LR+ (95% CI) | 12 (7.7–18.7) | 11.9 (7.6–18.5) |
ROC: Receiver Operating Characteristic, PPV: positive predictive value, NPV: negative predictive value, AUC: Area under curve, CI: Confidence interval, LR+: Positive likelihood ratio.