Table 5.
Hosmer-Lemeshow goodness of fit test values: 4 hours
| Score | Mortality probability classes (%) | Expected deaths | Observed deaths | Observed survivors | Expected survivors | χ2 goodness-of-fit test values | SMR (95% CI) |
| PIM 4 hours | <1 | 0.9 | 1 | 140 | 140.1 | 0.0 | |
| 1 to <5 | 7.9 | 13 | 368 | 373.1 | 3.4 | ||
| 5 to <15 | 13.1 | 14 | 144 | 144.9 | 0.1 | ||
| 15 to <30 | 14.4 | 18 | 50 | 53.6 | 1.1 | ||
| ≥30 | 32.2 | 34 | 20 | 21.8 | 0.2 | ||
| Total | 68.5 | 80 | 722 | 733.5 | 4.8 | 1.17 (0.93–1.45) | |
| PRISM 4 hours | <1 | 1.9 | 8 | 299 | 305.1 | 19.7 | |
| 1 to <5 | 7.7 | 20 | 321 | 333.3 | 20.1 | ||
| 5 to <15 | 6.6 | 12 | 68 | 73.4 | 4.8 | ||
| 15 to <30 | 6.5 | 10 | 21 | 24.5 | 2.4 | ||
| ≥30 | 28.3 | 30 | 13 | 14.7 | 0.3 | ||
| Totals | 51.0 | 80 | 722 | 751.0 | 47.3 | 1.57 (1.24–1.95)* | |
| PRISM III 4 hours | <1 | 1.9 | 6 | 455 | 459.1 | 8.9 | |
| 1 to <5 | 4.3 | 16 | 167 | 178.7 | 32.6 | ||
| 5 to <15 | 6.3 | 12 | 60 | 65.7 | 5.7 | ||
| 15 to <30 | 7.0 | 8 | 25 | 26.0 | 0.2 | ||
| ≥30 | 37.2 | 38 | 15 | 15.8 | 0.1 | ||
| Totals | 56.7 | 80 | 722 | 745.3 | 47.2 | 1.41 (1.12–1.76)* |
*Significantly greater than 1 (P < 0.0001 for PRISM at 4 hours and P = 0.0025 for PRISM III at 4 hours) [13]. CI, confidence interval; PIM, Paediatric Index of Mortality [4]; PRISM, Paediatric RISk of Mortality [1,2]; SMR, standardized mortality ratio.