Table 1 Case mix, outcome and activity for patients with acute kidney injury during the first 24 hours following admission to intensive care

Case mix

Age (years; mean ± SD)

63.2 ± 15.6

63.5 ± 15.0

63.1 ± 15.7

Sex (male; n [%])

11,511 (66.4)

3,617 (63.6)

6,925 (68.3)

Surgical status (n [%])

   Nonsurgical

14,479 (83.7)

5,005 (88.1)

8,125 (80.3)

   Elective surgery

961 (5.6)

187 (3.3)

717 (7.1)

   Emergency surgery

1,868 (10.8)

487 (8.6)

1,280 (12.6)

Serum parameters (mean ± SD)

   Highest serum creatinine (μmol/l)

459 ± 232

502 ± 244

431 ± 216

   Highest serum urea (mmol/l)

32.2 ± 27.3

29.5 ± 15.2

33.9 ± 32.3

   Lowest serum albumin (g/l)

21.3 ± 7.2

20.5 ± 6.9

21.6 ± 7.2

   Lowest haematocrit (%)

28.6 ± 6.4

28.1 ± 6.3

28.8 ± 6.3

APACHE II (mean ± SD)

   APS^b

20.2 ± 7.0

24.6 ± 6.5

17.9 ± 6.1

   Total score^b

24.8 ± 7.5

29.3 ± 7.0

22.4 ± 6.5

Outcome

Mortality (n [%])

   CMP unit

7,508 (43.3)

3,176 (55.8)

3,387 (33.4)

   Any hospital^c

9,725 (58.6)

3,850 (70.3)

4,770 (49.3)

Activity

Length of stay (days; median [IQR])

   CMP unit: survivors

4.1 (1.7–10.3)

5.7 (2.1–13.2)

4.0 (1.8–9.8)

   CMP unit: nonsurvivors

2.0 (0.8–6.1)

1.7 (0.9–5.0)

3.4 (1.5–8.9)

   Any hospital^c: survivors

31 (17–54)

38 (24–62)

29 (16–51)

   Any hospital^c: nonsurvivors

8 (3–20)

7 (2–18)

11 (4–23)

Transfers from another ICU (n [%])

1,355 (7.8)

561 (9.9)

730 (7.2)

Readmissions within hospital stay (n [%])

388 (2.2)

116 (2.0)

221 (2.2)