Table 3.
Hosmer–Lemeshow goodness-of-fit test values: time point for which the scores were developed
| Score | Mortality probability classes (%) | Expected deaths | Observed deaths | Observed survivors | Expected survivors | χ2 goodness-of-fit test values | SMR (95% CI) |
| PIM 1 hour | <1 | 1.3 | 3 | 175 | 176.7 | 2.2 | |
| 1 to <5 | 8.3 | 15 | 357 | 363.7 | 5.5 | ||
| 5 to <15 | 12.2 | 23 | 127 | 137.9 | 10.4 | ||
| 15 to <30 | 13.0 | 15 | 47 | 49.0 | 0.4 | ||
| ≥30 | 22.8 | 24 | 16 | 17.2 | 0.1 | ||
| Totals | 57.6 | 80 | 722 | 744.7 | 18.7 | 1.39 (1.10–1.73)* | |
| PRISM 24 hours | <1 | 1.5 | 4 | 237 | 239.5 | 4.2 | |
| 1 to <5 | 7.7 | 16 | 313 | 321.3 | 9.2 | ||
| 5 to <15 | 10.2 | 9 | 112 | 110.8 | 0.2 | ||
| 15 to <30 | 8.5 | 7 | 33 | 31.5 | 0.3 | ||
| ≥30 | 49.5 | 44 | 27 | 21.5 | 2.0 | ||
| Totals | 77.4 | 80 | 722 | 724.6 | 15.9 | 1.03 (0.82–1.29) | |
| PRISM III 12 hours | <1 | 1.8 | 4 | 422 | 424.2 | 2.7 | |
| 1 to <5 | 4.4 | 14 | 175 | 184.6 | 21.4 | ||
| 5 to <15 | 7.5 | 10 | 75 | 77.5 | 0.9 | ||
| 15 to <30 | 7.2 | 5 | 27 | 24.8 | 0.9 | ||
| ≥30 | 51.1 | 47 | 23 | 18.9 | 1.2 | ||
| Totals | 72.0 | 80 | 722 | 730.0 | 27.1 | 1.11 (0.88–1.38) | |
| PRISM III 24 hours | <1 | 1.7 | 3 | 474 | 475.3 | 1.0 | |
| 1 to <5 | 3.3 | 12 | 133 | 141.7 | 23.5 | ||
| 5 to <15 | 7.0 | 14 | 72 | 79.0 | 7.7 | ||
| 15 to <30 | 6.2 | 5 | 25 | 23.8 | 0.3 | ||
| ≥30 | 48.6 | 46 | 18 | 15.4 | 0.6 | ||
| Totals | 66.8 | 80 | 722 | 735.2 | 33.0 | 1.20 (0.95–1.49) |
*Significantly greater than 1 (P = 0.002) [13]. CI, confidence interval; PIM, Paediatric Index of Mortality [4]; PRISM, Paediatric RISk of Mortality [1,2]; SMR, standardized mortality ratio.