Table 3 Summary of kidney function for patients admitted to the intensive care unit with acute kidney injury from the Australia New Zealand Intensive Care Society Adult Patient Database 1996–2005

Incidence of acute kidney injury (%) (95% confidence interval)

5.2 (5.1–5.4)

5.0 (4.6–5.3)

4.6 (4.3–4.9)

5.0 (4.7–5.3)

6.0 (5.7–6.3)

5.3 (5.0–5.6)

APACHE II score (mean (standard deviation))

27 (8.4)

27.8 (8.5)

27.1 (8.4)

27.1 (8.4)

26.6 (8.6)

26.7 (8.0)

Simplified Acute Physiology Score II score (mean (standard deviation))

52.3 (18.6)

56 (18.8)

55.4 (18.7)

50.9 (18.1)

50.4 (18.9)

50.9 (17.8)

Serum creatinine (μmol/l) (median (interquartile range))

245 (170–362)

261 (200–390)

255 (190–365)

240 (148–356)

230 (157–353)

243 (170–360)

Serum creatinine ≥ 133 μmol/l (%)

86.8

93.3

91

78.4

84

89.1

Serum urea (mmol/l) (mean (standard deviation))

20.4 (12.5)

21.7 (13.1)

20.4 (11.6)

20.4 (12.3)

19.6 (12.5)

20.1 (12.5)

Urine output (ml/hour) (median (interquartile range))

40 (11.6–95)

23.6 (9.6–90)

22.9 (9–82)

50.6 (14.1–105)

51 (15–105)

36.8 (11.6–89)

Oliguria (< 410 ml/24 hour) (%)

38.7

48.7

47.4

32.4

32.3

37.1