Performance of the three scoring systems for combined hospital data
| Pre-ICU PRISM (n=928) | PIM (n=928) | PRISM II (n=903) | |
|---|---|---|---|
| ROC, receiver operating characteristic; CI, confidence interval. | |||
| Median percentage risk (IQR) | 6.1 (2.9–17.5) | 8.3 (4.3–15.5) | 3.3 (1.4–10.1) |
| Mean percentage risk (SD) | 14.4 (20.7) | 13.6 (16.2) | 9.4 (15.3) |
| Area under ROC curve (95% CI) | 0.83 (0.78 to 0.89) | 0.87 (0.82 to 0.92) | 0.86 (0.81 to 0.92) |
| Standardised mortality ratio (95% CI) | 0.54 (0.42 to 0.67) | 0.57 (0.44 to 0.70) | 0.71 (0.53 to 0.89) |
| Z score | 7.08 | 5.85 | 3.31 |
| Standardised Z score | 7.05 | 2.69 | 2.44 |
| Hosmer-Lemeshow χ2 | 59.4 | 38.9 | 14.2 |
| Hosmer-Lemeshow p | <0.0001 | <0.0001 | 0.08 |