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Table 1 Characteristics by AKI level among 30,762 ICU patients, Northern Denmark, 2005 to 2010

From: One-year mortality among Danish intensive care patients with acute kidney injury: a cohort study

 

Without AKI

n= 25,969

(84.4%)

AKI-risk

n= 1,986

(6.5%)

AKI-injury

n= 1,311

(4.3%)

AKI-failure

n= 1,496

(4.9%)

Age

    

   Median age (IQR)

64 (49, 75)

72 (61, 80)

71 (59, 80)

69 (59, 78)

Gender

    

   Female

11,172 (43.0%)

878 (44.2%)

645 (49.2%)

657 (43.9%)

   Male

14,797 (57.0%)

1,108 (55.8%)

666 (50.8%)

839 (56.1%)

Charlson comorbidity index score a

    

   Low (score 0)

13,862 (53.4%)

798 (40.2%)

510 (38.9%)

556 (37.2%)

   Medium (score 1 to 2)

8,654 (33.3%)

804 (40.5%)

507 (38.7%)

579 (38.7%)

   High (score ≥ 3)

3,453 (13.3%)

384 (19.3%)

294 (22.4%)

361 (24.1%)

Chronic kidney disease b

    

   Yes

3,283 (12.6%)

395 (19.9%)

199 (15.2%)

470 (31.4%)

   No

22,686 (87.4%)

1,591 (80.1%)

1,112 (84.8%)

1,026 (68.6%)

Surgical status c, d

    

   Non-surgical

9,495 (36.6%)

892 (44.9%)

593 (45.2%)

786 (52.5%)

   Surgical

    

Acute non-cardiac

8,271 (31.8%)

752 (37.9%)

564 (43.0%)

554 (37.0%)

Acute cardiac

920 (3.5%)

102(5.1%)

40 (3.1%)

34 (2.3%)

Elective non-cardiac

3,939 (15.2%)

188 (9.5%)

101 (7.7%)

106 (7.1%)

Elective cardiac

3,344 (12.9%)

52 (2.6%)

13 (1.0%)

16 (1.1%)

Primary diagnosis during current hospitalization

    

   Septicemia

232 (0.9%)

100 (5.0%)

127 (9.7%)

187 (12.5%)

   Other infectious diseases

2,329 (9.0%)

254 (12.8%)

182 (13.9%)

194 (13.0%)

   Endocrinology diseases

359 (1.4%)

65 (3.3%)

52 (4.0%)

82 (5.5%)

   Cardiovascular diseases

7.377 (28.4%)

464 (23.4%)

196 (15.0%)

183 (12.2%)

   Respiratory diseases

1,427 (5.5%)

180 (9.1%)

77 (5.9%)

66 (4.4%)

   Gastrointestinal or liver diseases

2,416 (9.3%)

322 (16.2%)

266 (20.3%)

239 (16.0%)

   Cancer or other neoplasm

3.410 (13.1%)

175 (8.8%)

139 (10.6%)

130 (8.7%)

   Trauma or poisoning

4,651 (17.9%)

168 (8.5%)

110 (8.4%)

96 (6.4%)

   Other

3,758 (14.5%)

258 (13.0%)

162 (12.4%)

319 (21.3%)

Laboratory information

    

   Baseline creatinine measured

17,384 (66.9%)

1,530 (77.0%)

950 (72.5%)

1.164 (77.8%)

   ICU admission creatinine, μmol/L (IQR)

75 (61, 92)

137 (112, 168)

190 (153, 230)

375 (280, 516)

ICU treatments

    

   Acute renal replacement therapy

482 (1.9%)

206 (10.4%)

220 (16.8%)

561 (37.5%)

   Mechanical ventilation

9,673 (37.2%)

965 (48.6%)

697 (53.2%)

719 (48.1%)

   Inotropes/vasopressors

7,823 (30.1%)

939 (47.3%)

756 (57.7%)

864 (57.8%)

Length of admission

    

   In-hospital days, median (IQR)

10 (4, 19)

13 (5, 26)

14 (5, 30)

16 (6, 33)

   In-hospital days before ICU admission, median (IQR)

1 (0, 2)

1 (0, 3)

1 (0, 3)

1 (0, 3)

  1. Results are presented as number (percent) of patients unless stated otherwise.
  2. aCharlson comorbidity index score after exclusion of kidney diseases.
  3. beGFR < 60 ml/min per 1.73 m2.
  4. cSurgical status and cardiac surgical status identified by surgery and type of surgery on or up to 7 days before ICU admission.
  5. dAcute and elective status classified according to hospital admission type.
  6. AKI, acute kidney injury; CI, confidence interval; ICU, intensive care unit; IQR, interquartile range.
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