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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.