Number of study participants, number admitted, sensitivity, specificity, predictive values and likelihood ratios at low, moderate, high and very-high-risk categories for the original Pra and modified Pra
| Risk category | Number of participants (n) | ≥1 emergency admission (n) | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | LR+ | LR− |
|---|---|---|---|---|---|---|---|---|
| Original Pra | ||||||||
| Low risk (0–0.34) | 569 | 73 | 100 | 0 | 18 | – | 1.0 | – |
| Moderate risk (0.35–0.49) | 226 | 55 | 53 | 70 | 28 | 87 | 1.7 | 0.7 |
| High risk (0.5–0.69) | 62 | 25 | 17 | 95 | 41 | 84 | 3.2 | 0.9 |
| Very high risk (≥0.7) | 1 | 1 | 1 | 100 | 100 | 82 | – | 1.0 |
| Modified Pra | ||||||||
| Low risk (0–0.34) | 198 | 18 | 100 | 0 | 18 | – | 1.0 | – |
| Moderate risk (0.35–0.49) | 273 | 33 | 88 | 25 | 20 | 91 | 1.1 | 0.5 |
| High risk (0.5–0.69) | 331 | 77 | 67 | 59 | 26 | 89 | 1.6 | 0.6 |
| Very high risk (≥0.7) | 60 | 26 | 17 | 95 | 43 | 84 | 3.5 | 0.9 |
LR, likelihood ratio; NPV, negative predictive value; PPV, positive predictive value; Pra, Probability of repeated admission.