PEI cut-off score | Sensitivity (%) | Specificity (%) | Positive predictive value (PPV), (%) | Negative predictive value (NPV), (%) |
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| Q1 | Q2 | Q1 | Q2 | Q1 | Q2 | Q1 | Q2 |
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Zero points (0 vs 1–12) | 86.6 | 64.8 | 75.4 | 100.0 | 86.9 | 54.4 | 41.4 | 100.0 |
Three points (0–3 vs 4–12) | 69.7 | 92.0 | 66.9 | 81.4 | 70.0 | 78.4 | 68.6 | 93.3 |
Six points (0–6 vs 7–12) | 90.0 | 98.1 | 60.0 | 63.9 | 38.4 | 43.2 | 95.6 | 98.1 |
- Sensitivity = the proportion of “true positive” patients, i.e. patients who answered positively to Q1 or Q2 among those who had higher PEI scores
- Specificity = the proportion of “true negative” patients, i.e. patients who answered negatively to Q1 or Q2 among those who had lower PEI scores
- Positive predictive value = the proportion of patients who actually had a higher PEI score among those who answered positively to Q1 or Q2
- Negative predictive value = the proportion of patients who actually had a lower PEI score among those who answered negatively to Q1 or Q2