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Table 2 Comparison between CMP UK database and admissions to RBH ICU

From: Process monitoring in intensive care with the use of cumulative expected minus observed mortality and risk-adjusted p charts

Parameter CMP database, Jan to Dec 2003 RBH, Jan 2003 to Jun 2004
  n Value n Value
Case mix     
   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     
   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     
   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     
Median length of stay (days) 55,936 2.11 731 1.8
  1. a in accordance with the ICNARC Casemix programme
  2. APACHE, Acute Physiology and Chronic Health Evaluation; CMP, Case Mix Programme; ICU, intensive care unit; RBH, Royal Berkshire Hospital.