Table 1

Numbers of admissions in the Case Mix Programme Database meeting the exclusion criteria for Acute Physiology and Chronic Health Evaluation II (N = 129,647)

Exclusion criterion
n
%

Age at admission < 16 years
3658
2.8
Length of stay in unit < 8 hours
11,139
8.6
Admission for primary burns
238
0.2
Admission following coronary artery bypass grafting
1877
1.4
Readmission within the same hospital stay
6024
4.6
Transferred in from another critical care unit
5285
4.1
Missing all 12 physiological variables
1600
1.2
Total excluded (any of the above)
27,097
20.9

Harrison et al. Critical Care 2004 9(Suppl 3):S1   doi:10.1186/cc3745