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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)

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

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