Wald statistic for independent variables of final models by outcome and population
| Upper quartile length of stay | 30 day non-elective readmission | In-hospital mortality | ||||
| Elective | Non-elective | Elective | Non-elective | Elective | Non-elective | |
| Age | 31.1 | 31.4 | 0.0 | 0.4 | 46.4 | 747.2 |
| Sex | 18.7 | 0.2 | 6.9 | 77.6 | 9.5 | 85.2 |
| Country | 162.0 | 244.2 | 31.1 | 102.1 | 12.8 | 137.8 |
| Admission history | - | - | 225.9 | 1888.4 | - | - |
| Dr Foster global frailty score | 1020.7 | 2579.9 | 2.0 | 3.8 | 62.7 | 318.2 |
| Elixhauser score | 1727.5 | 4075.1 | 420.4 | 848.4 | 973.9 | 4842.1 |