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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.