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Table 2 Case mix, outcome and activity for all admissions in the Case Mix Programme Database (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

   N* Mean/median/n (SD/IQR/%)
Case mix     
Mean (SD) age (years)   129,641 58.7 (19.8)
Median (IQR) age (years)   129,641 63 (47–73)
Gender male (n [%])   129,643 76,072 (58.7)
APACHE II     
   Mean (SD) Acute Physiology Score   102,239 12.5 (6.7)
   Mean (SD) APACHE II score   102,237 16.5 (7.4)
   Mean (SD) UK mortality probability   99,281 0.255 (0.222)
   Median (IQR) UK mortality probability   99,281 0.181 (0.084–0.375)
Surgical status (n [%])   129,604   
   Nonsurgical    71,473 (55.1)
   Elective/scheduled surgery    33,649 (26.0)
   Emergency/urgent surgery    24,270 (18.7)
   Surgery, unknown classification    212 (0.2)
Outcome     
Mortality (n [%])     
   CMP unit   123,610 25,142 (20.3)
   Any critical care unit   121,977 26,238 (21.5)
   Hospital housing CMP unit   122,062 34,912 (28.6)
   Any hospital   119,807 36,937 (30.8)
Activity     
Median (IQR) length of stay (days)     
   CMP unit Survivors 102,826 1.7 (0.8–4.0)
  Nonsurvivors 26,344 2.0 (0.7–6.1)
   Any critical care unit Survivors 99,896 2 (1–5)
  Nonsurvivors 27,133 2 (1–7)
   Hospital housing CMP unit Survivors 90,704 14 (7–27)
  Nonsurvivors 36,991 8 (2–19)
   Any hospital Survivors 85,761 16 (9–33)
  Nonsurvivors 38,651 9 (3–22)
  1. APACHE, Acute Physiology and Chronic Health Evaluation; CMP, Case Mix Programme; IQR, interquartile range; SD, standard deviation. * Number of nonmissing and nonexcluded observations. Exclusions: aged younger than 16 years, unit stay less than 8 hours, admission for primary burns or coronary artery bypass grafting, readmission within the same hospital stay, direct transfer in from another critical care unit, missing all 12 physiology variables. Exclusions: readmission to the CMP unit within the same hospital stay.