Parameter | CMP database, Jan to Dec 2003 | RBH, Jan 2003 to Jun 2004 | ||
---|---|---|---|---|
 | n | Value | n | Value |
Case mix | Â | Â | Â | Â |
   Age, years (mean ± SD) | 55,936 | 60 ± 19.3 | 731 | 57 ± 20.4 |
   Median age, years | 55,936 | 64 | 731 | 62 |
   Gender male, % | 32,035 | 57.3 | 731 | 54.7 |
APACHE II | Â | Â | Â | Â |
   APACHE II score (mean ± SD) | 45,099 | 16.7 ± 7.4 | 589 | 20.8 ± 8.3 |
   UK mortality probability, % (mean ± SD) | 45,099 | 26.3 ± 22.2 | 589 | 33.5 ± 26.1 |
   Median UK mortality probability | 45,099 | 19.1 | 589 | 25.8 |
Surgical status, % | 55,936 | 100 | 731 | 100 |
   Nonsurgical, % | 30,545 | 54.6 | 450 | 61.6 |
   Elective/scheduled surgery, % | 13,825 | 24.7 | 168 | 23 |
   Emergency/urgent surgery, % | 11,494 | 20.5 | 113 | 15.5 |
   'Surgery, unknown classification', % | 72 | 0.1 | 0 | 0 |
Outcome | Â | Â | Â | Â |
   Mortality, all patients, % | 45,099 | 27.7 | 731 | 28.9 |
   Mortality, included for scoringa, % | 53,464 | 29.3 | 589 | 26.0 |
   Standardised mortality ratio |  | 1.11 |  | 0.78 |
Activity | Â | Â | Â | Â |
Median length of stay (days) | 55,936 | 2.11 | 731 | 1.8 |