Table 1.
Characteristics of the cohort
| Variables | Mean (SD) |
| Age (years) | 53.5 (19.5) |
| Male/female (%) | 6,871/4,236 (61.9/38.1) |
| Admission source (%) | |
| Operating room | 4,885 (44.0) |
| Recovery room | 638 (5.7) |
| Emergency department | 2,976 (26.8) |
| Ward | 1,481 (13.3) |
| Another hospital | 1,127 (10.1) |
| Primary organ failure (%) | |
| Cardiovascular | 3,693 (33.2) |
| Neurological | 3,893 (35.0) |
| Respiratory | 2,682 (24.1) |
| Gastrointestinal | 401 (3.6) |
| Renal | 167 (1.5) |
| Metabolic | 217 (2.0) |
| Haematological | 49 (0.4) |
| ICU stay (days) | 5.1 (7.8) |
| Hospital stay (days) | 21.1 (29.3) |
| Admission APACHE II score | 12.7 (7.3) |
| Worst 24-hour APACHE II score | 15.4 (7.9) |
| Admission APACHE predicted mortality (%) | 15.5 (19.1) |
| Worst 24-hour APACHE predicted mortality (%) | 19.3 (22.1) |
| Actual ICU mortality (%) | 12.0 |
| Actual hospital mortality (%) | 16.3 |
All data in parentheses are standard deviations unless stated otherwise. APACHE, Acute Physiology and Chronic Health Evaluation; ICU, intensive care unit; SD, standard deviation.