Table 2 Demographic characteristics of patients
From: Stratification of the severity of critically ill patients with classification trees
| Â | Group (n = 2684) | Development (n = 1880) | Validation (n = 804) | p-value c |
|---|---|---|---|---|
   Age (years)a | 55.0 (19) | 55.2 (19) | 54.6 (19) | 0.485 |
   Sex, male (%) | 66.9 | 66.8 | 67.3 | 0.786 |
   Elective (%) | 6.5 | 6.1 | 7.5 | 0.184 |
Diagnostic category | Â | Â | Â | 0.414 |
   TBI (%) | 15.1 | 15.2 | 14.9 |  |
   Trauma (%) | 15.2 | 15.2 | 15.3 |  |
   Neurological (%) | 14.8 | 14.6 | 15.3 |  |
   Respiratory (%) | 19.0 | 18.1 | 21.1 |  |
   Surgery (%) | 18.7 | 19.4 | 17.0 |  |
   O Medicine (%) | 17.2 | 17.6 | 16.3 |  |
   MV (%) | 65.9 | 66.6 | 64.2 | 0.216 |
   Inotropic therapy (%) | 33.7 | 33.9 | 33.3 | 0.783 |
   Acute renal failure (%) | 19.9 | 19.8 | 20.3 | 0.773 |
   Infection (%) | 34.6 | 34.6 | 34.8 | 0.900 |
   Coagulopathy (%) | 12.2 | 12.1 | 12.6 | 0.724 |
   COI (%) | 16.0 | 16.3 | 15.4 | 0.582 |
   HRa | 107.8 (30) | 108.3 (31) | 106.5 (30) | 0.253 |
   Glasgowa | 12.9 (4) | 12.8 (4) | 13.0 (4) | 0.507 |
   (A-a)O2 gradienta | 244.1 (161) | 241.7 (160) | 249.5 (162) | 0.250 |
   APACHE IIb | 18 (7-41) | 18 (6-37) | 16 (6-45) | 0.805 |
   SAPS IIb | 15 (6-47) | 15 (5-35) | 14 (5-47) | 0.742 |
   MPM II-24b | 17 (7-43) | 17 (6-37) | 15 (6-38) | 0.779 |
   LOS (days)b | 7 (3-16) | 7 (3-16) | 7 (3-15) | 0.972 |
   MORT (%) | 31.4 | 30.7 | 32.8 | 0.308 |