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Table 1 Case mix, outcome and activity for patients with acute kidney injury during the first 24 hours following admission to intensive care

From: Case mix, outcome and activity for patients with severe acute kidney injury during the first 24 hours after admission to an adult, general critical care unit: application of predictive models from a secondary analysis of the ICNARC Case Mix Programme Database

Category Parameter All patients (n = 17,326) Oligurica (n = 5,687) Nonoligurica (n = 10,133)
Case mix Age (years; mean ± SD) 63.2 ± 15.6 63.5 ± 15.0 63.1 ± 15.7
  Sex (male; n [%]) 11,511 (66.4) 3,617 (63.6) 6,925 (68.3)
  Surgical status (n [%])    
     Nonsurgical 14,479 (83.7) 5,005 (88.1) 8,125 (80.3)
     Elective surgery 961 (5.6) 187 (3.3) 717 (7.1)
     Emergency surgery 1,868 (10.8) 487 (8.6) 1,280 (12.6)
  Serum parameters (mean ± SD)    
     Highest serum creatinine (μmol/l) 459 ± 232 502 ± 244 431 ± 216
     Highest serum urea (mmol/l) 32.2 ± 27.3 29.5 ± 15.2 33.9 ± 32.3
     Lowest serum albumin (g/l) 21.3 ± 7.2 20.5 ± 6.9 21.6 ± 7.2
     Lowest haematocrit (%) 28.6 ± 6.4 28.1 ± 6.3 28.8 ± 6.3
  APACHE II (mean ± SD)    
     APSb 20.2 ± 7.0 24.6 ± 6.5 17.9 ± 6.1
     Total scoreb 24.8 ± 7.5 29.3 ± 7.0 22.4 ± 6.5
Outcome Mortality (n [%])    
     CMP unit 7,508 (43.3) 3,176 (55.8) 3,387 (33.4)
     Any hospitalc 9,725 (58.6) 3,850 (70.3) 4,770 (49.3)
Activity Length of stay (days; median [IQR])    
     CMP unit: survivors 4.1 (1.7–10.3) 5.7 (2.1–13.2) 4.0 (1.8–9.8)
     CMP unit: nonsurvivors 2.0 (0.8–6.1) 1.7 (0.9–5.0) 3.4 (1.5–8.9)
     Any hospitalc: survivors 31 (17–54) 38 (24–62) 29 (16–51)
     Any hospitalc: nonsurvivors 8 (3–20) 7 (2–18) 11 (4–23)
  Transfers from another ICU (n [%]) 1,355 (7.8) 561 (9.9) 730 (7.2)
  Readmissions within hospital stay (n [%]) 388 (2.2) 116 (2.0) 221 (2.2)
  1. aOliguria is defined as urine output < 400 ml/24 hours; admitted patients staying less than 8 hours in the ICU excluded. bAPACHE II exclusions: age < 16 years; ICU stay < 8 hours; readmissions within same hospital stay; transfers from another ICU; admissions following coronary artery bypass surgery; and admissions for primary burns. cExcluding readmissions within the same hospital stay. APACHE, Acute Physiology and Chronic Health Evaluation; APS, Acute Physiology Score; CMP, Case Mix Programme; ICU, intensive care unit; IQR, interquartile range; SD, standard deviation.