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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.