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Table 3 Baseline characteristics of AKI patients according to the maximum RIFLE class reached during the intensive care unit staya

From: Multiple-center evaluation of mortality associated with acute kidney injury in critically ill patients: a competing risks analysis

Variable Class R patients (n= 1,025) Class I patients (n= 830) Class F patients (n= 991) P value
Mean age, years (±SD) 67.6 (15.8) 66.7 (15.7) 64.9 (16.0) <0.001
Males, n (%) 588 (57.4) 502 (60.5) 582 (58.7) 0.4
Mean SAPS II score (±SD) 45.2 (17.4) 51.9 (21.2) 53.8 (20.3) <0.0001
Mean APACHE II score (±SD) 18 (6.6) 20.6 (7.1) 21.4 (7.1) <0.0001
Mean non-renal SOFA score (±SD) 4.8 (3.1) 5.8 (3.3) 5.4 (3.4) <0.0001
Transfer from ward, n (%) 477 (46.5) 387 (46.6) 499 (50.4) 0.16
McCabe class, n (%)
   1 608 (59.3) 476 (57.3) 582 (58.7) 0.8
   2 342 (33.4) 290 (35.0) 327 (33)  
   3 75 (7.3) 64 (7.7) 82 (8.3)  
Admission category, n (%)
   Medical 754 (73.6) 592 (71.3) 697 (70.3) <0.002
   Scheduled surgery 130 (12.7) 85 (10.2) 96 (9.7)  
   Unscheduled surgery 141 (13.8) 153 (18.4) 198 (20.0)  
Chronic coexisting conditions, n (%)
   Cardiac disease 185 (18.1) 163 (19.6) 161 (16.3) 0.2
   Respiratory disease 165 (16.1) 101 (12.2) 100 (10.1) <0.001
   Liver disease 61 (6.0) 59 (7.1) 58 (5.9) 0.5
   Immunodeficiency 143 (14.0) 137 (16.5) 160 (16.2) 0.2
Uncomplicated diabetes mellitus 125 (12.2) 90 (10.8) 105 (10.6) 0.5
Complicated diabetes mellitus 45 (4.4) 40 (4.8) 63 (6.4) 0.1
  1. aAKI, acute kidney injury; SAPS, Simplified Acute Physiology Score; APACHE, Acute Physiology and Chronic Health Evaluation; SOFA, Sequential Organ Failure Assessment; non-renal SOFA: SOFA renal component.