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Table 3 Summary of existing multicentre literature on case mix and outcomes for admissions to UK critical care units

From: Case mix, outcome and length of stay for admissions to adult, general critical care units in England, Wales and Northern Ireland: the Intensive Care National Audit & Research Centre Case Mix Programme Database

  CMPD ICS APACHE II Study in Britain and Ireland [20, 21] European/ North American Severity Study Group* [22] North Thames Region [23] Scottish Intensive Care Society Audit Group [24] South West Thames Region [25]
Admissions 129,647 9155 136 12,762 10,393 16,646
Units 128 26 4 15 22 17
Mean age 58.7 56.3 57.4 57.1 58.9 61
Male (%) 58.7 60.0 61.8 - 55.4 58.8
Surgical status (%)       
   Nonsurgical 55.1 43.2 47.8 - 51.4 59.0
   Elective 26.0 21.2 24.3 - 21.3 25.1
   Emergency 18.7 25.6 27.9 - 27.3 15.9
APACHE II       
   Mean score 16.5 17.9 - - - 15
   Mean probability 0.255 0.272 - 0.286 0.300 0.224
Mortality (%)       
   Unit 20.3 17.9 - 23.7 20.5 18.3
   Hospital 28.6 27.7 32.4 32.5 29.4 26.6
  1. APACHE, Acute Physiology and Chronic Health Evaluation; CMPD, Case Mix Programme Database; ICS, Intensive Care Society; -, not available from published report(s). * UK admissions only selected from a multinational database