Table 1 Patient characteristics of all patients and compared between patients with and patients without acute kidney injury

Age (yr)

64 (52–77)

67 (54–78)

63 (50–75)

<0.001

Male sex

1578 (62.5)

742 (63.3)

836 (61.7)

0.434

APACHE II score

14 (10–20)

17 (12–23)

13 (9–17)

<0.001

SAPS II score

34 (26–46)

40 (31–52)

31 (24–39)

<0.001

SOFA score

6 (4–9)

7 (5–10)

5 (3–7)

<0.001

Vasoactive therapy

1009 (40.0)

576 (49.1)

433 (32.0)

<0.001

Mechanical ventilation

1702 (67.4)

818 (69.8)

884 (65.3)

0.017

Baseline creatinine (μmol/L)

81.9 (69.0–96.0)

84.9 (73.0–97.0)

79.8 (66.8–95.0)

<0.001

Sepsis

808 (32.0)

512 (43.7)

296 (21.9)

<0.001

Fluid balance within 24 h (L)

0.57 (−0.19 to 1.43)

0.64 (−0.20 to 1.70)

0.53 (−0.18 to 1.30)

<0.001

Fluid balance within 48 h (L)

0.88 (−0.37 to 2.30)

1.06 (−0.38 to 2.82)

0.73 (−0.37 to 1.91)

<0.001

Fluid balance within 72 h (L)

1.12 (−0.48 to 2.86)

1.40 (−0.49 to 3.54)

0.91 (−0.48 to 2.44)

0.001

Use of diuretics (%)

1500 (59.4)

872 (74.4)

628 (46.4)

<0.001

28-day mortality

438 (17.3)

301 (25.7)

137 (10.1)

<0.001

Length of ICU stay (days)

6 (4–11)

7 (5–14)

5 (4–9)

<0.001