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Table 1 Comparison of patients excluded from scoring between patients in CMP UK database and those admitted to the RBH

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
  Number % Number %
Total number of admissions 55,936 100.00 731 100.00
Age at admission <16 years 978 1.75 17 2.33
Length of stay in unit <8 hours 3,636 6.50 39 5.34
Admission for primary burns 121 0.22 0 0.00
Admission after coronary artery bypass grafting 36 0.06 0 0.00
Readmission within the same hospital stay 2,911 5.20 34 4.65
Transferred in from another critical care unit 1,836 3.28 27 3.69
Missing all 12 physiological variables 1,488 2.66 26 3.56
Total number included for scoring 44,930 80.32 588 80.44
  1. CMP, Case Mix Programme; RBH, Royal Berkshire Hospital.