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Table 2 Incidence rates (95% confidence intervals) of acute kidney injury stratified by two-year intervals, and admission characteristics from the Australia New Zealand Intensive Care Society Adult Patient Database 1996–2005

From: Changes in the incidence and outcome for early acute kidney injury in a cohort of Australian intensive care units

Covariate

Cumulative

Incidence rates per two-year period

 

Cases

(n = 4,754)

Incidence

(5.2 (5.1–5.4))

1996/1997

(n = 849)

1998/1999

(n = 684)

2000/2001

(n = 926)

2002/2003

(n = 1,158)

2004/2005

(n = 1,137)

Admission category

       

   Elective

544

1.7 (1.5–1.8)

1.4 (1.1–1.7)

1.0 (0.7–1.3)

1.5 (1.3–1.8)

2.4 (2.1–2.8)

1.8 (1.4–2.1)

   Nonelective

4,209

7.2 (7.0–7.4)

7.0 (6.5–7.4)

6.8 (6.3–7.3)

7.2 (6.7–7.7)

7.9 (7.5–8.4)

7.0 (6.6–7.5)

Admission type

       

   Surgical

957

2.1 (2.0–2.2)

2.5 (2.2–2.8)

2.0 (1.7–2.3)

1.7 (1.4–2.0)

2.6 (2.3–2.9)

1.9 (1.7–2.2)

   Medical

3,752

8.3 (8.0–8.5)

7.5 (7.0–8.1)

7.6 (7.0–8.2)

8.5 (7.9–9.1)

9.3 (8.7–9.9)

8.1 (7.6–8.6)

Surgical subcategory

       

   Cardiovascular

376

1.6 (1.4–1.8)

1.9 (1.5–2.2)

1.8 (1.4–2.3)

1.3 (1.0–1.6)

1.7 (1.4–2.1)

1.3 (1.0–1.6)

   Trauma

72

1.7 (1.3–2.1)

2.9 (1.6–4.2)

1.6 (0.7–2.4)

1.4 (0.7–2.1)

1.5 (0.7–2.2)

1.7 (0.8–2.6)

Diagnostic category

       

   Sepsis/septic shock

1,109

19.5 (18.5–20.5)

23.0 (20.0–26.0)

19.1 (16.0–22.2)

20.6 (18.1–23.1)

22.9 (20.6–25.2)

15.4 (13.8–17.0)

   Cardiac

658

11.2 (10.4–12.0)

9.6 (8.0–11.3)

12.5 (10.3–14.6)

10.9 (9.0–12.7)

11.8 (10.0–13.6)

11.6 (9.9–13.3)

   Hepatic

362

8.0 (7.2–8.8)

7.4 (5.6–9.2)

7.5 (5.5–9.5)

9.4 (7.3–11.4)

7.9 (6.1–9.6)

7.9 (6.5–9.4)

   Gastrointestinal bleeding

108

6.1 (5.0–7.3)

4.7 (2.3–7.1)

5.3 (2.2–8.4)

5.7 (3.0–8.4)

8.9 (6.1–11.7)

5.5 (3.6–7.4)

Metabolic/poisoning

191

3.9 (3.4–4.4)

3.1 (1.9–4.2)

3.3 (2.1–4.6)

4.2 (2.9–5.5)

3.9 (2.7–5.1)

4.5 (3.4–5.7)

   Respiratory

383

3.4 (3.0–3.7)

2.7 (2.1–3.4)

3.0 (2.3–3.8)

3.7 (3.0–4.5)

4.2 (3.4–5.0)

3.1 (2.4–3.8)

   Neurologic

101

2.1 (1.7–2.5)

1.9 (1.0–2.8)

2.0 (1.0–3.1)

2.1 (1.2–3.0)

2.0 (1.2–2.9)

2.3 (1.4–3.1)