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Table 2 Characteristics and outcome depending on degree of renal function.

From: Correlation between the AKI classification and outcome

 

No AKI

n = 14,405

(65.6%)

AKI 1

n = 4259

(19.1%)

AKI II

n = 857

(3.8%)

AKI III

n = 2782

(12.5%)

AKI

(I + II + III)

n = 7898

(35.4%)

p

AKI

vs no AKI

p

AKI III

vs

AKI I

Age

Mean (SD)

60.5 (16.56)

62.1 (15.93)

60.4 (16.55)

61.1 (15.66)

61.5 (15.91)

< 0.0001

0.089

Range

16 to 99

16 to 95

16 to 92

16 to 90

16 to 95

  

APACHE II score at admission to ICU

Median

13

16

17

21

18

< 0.0001

< 0.0001

Range

0 to 49

0 to 44

3 to 39

1 to 52

0 to 52

  

SOFA score on admission to ICU

Median

5

7

7

9

7

< 0.0001

< 0.0001

Range

0 to 21

0 to 18

2 to 19

0 to 22

0 to 22

  

Number of associated failed organs at admission to ICU*

Median

0

1

1

1

1

< 0.0001

< 0.0001

Range

0 to 6

0 to 5

0 to 5

0 to 6

0 to 6

  

Maximum number of associated failed organ systems*

Median

1

1

2

2

2

< 0.0001

< 0.0001

Range

0 to 6

0 to 5

0 to 6

0 to 6

0 to 6

  

Mechanical ventilation

Number of patients

8379 (58.2%)

3441

(80.8%)

696

(81.2%)

2416

(86.8%)

6553

(82.97%)

< 0.0001

< 0.0001

Outcome

ICU

mortality

1548

(10.7%)

856

(20.1%)

222

(25.9%)

1379

(49.6%)

2457

(31.1%)

< 0.0001

< 0.0001

Hospital

mortality

2438

(16.9%)

1272

(29.9%)

307

(35.8%)

1610

(57.9%)

3189

(40.4%)

< 0.0001

< 0.0001

Length of stay in ICU (days): ICU survivors

Median

2

6

7

9

7

< 0.0001

< 0.0001

Range

(2 to 55)

(3 to 109)

(3 to 112)

(1 to 270)

(1 to 270)

  

Length of stay in ICU (days): ICU non-survivors

Median

2

7

7

8

7

< 0.0001

< 0.0001

Range

(2 to 64)

(3 to 73)

(3 to 54)

(1 to 110)

(1 to 110)

  

Timing of AKI in ICU

First 48 hours

-

3529 (82.9%)

558 (65.1%)

2075 (74.6%)

6162 (78.0%)

  

Day 3 to 5

-

424 (9.96%)

120 (14.0%)

332 (11.9%)

876 (11.1%)

  

Day 6 to 9

-

193 (4.5%)

68 (7.9%)

207 (7.4%)

468 (5.9%)

  

Day 10 – 14

-

73

(1.7%)

49

(5.7%)

99

(3.6%)

221

(2.8%)

  

Day 15 – 19

-

20

(0.5%)

20

(2.3%)

31

(1.1%)

71

(0.9%)

  

> 19th day

-

20

(0.5%)

42

(4.9%)

38

(1.4%)

100

(1.3%)

  
  1. * excluding acute kidney injury
  2. AKI = acute kidney injury; APACHE = Acute Physiology and Chronic Health Evaluation; ICU = intensive care unit; SD = standard deviation; SOFA score = Sequential Organ Failure Assessment score.
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