Table 4

Outcomes for all patients and for patients classified according to the maximum Risk, Injury, Failure, Loss, and End-stage Kidney (RIFLE) class

No acute kidney injury (n = 1,766)

Risk (n = 670)

Injury (n = 1,436)

Failure (n = 1,511)

All injury (n = 5,383)

Renal replacement therapy*

1 (0.1%)

0 (0%)

4 (0.3%)

214 (14.2%)

219 (4.1%)

Hospital LOS after reaching maximum RIFLE class (days)*

5 (3–10)

5 (3–10)

7 (4–14)

11 (5–23)

7 (3–14)

ICU LOS (days)*

3 (2–4)

3 (2–6)

5 (3–10)

9 (4–21)

4 (2–9)

Hospital LOS (days)*

6 (4–10)

8 (5–14)

10 (6–19)

16 (9–31)

9 (5–19)

Hospital mortality*

97 (5.5%)

59 (8.8%)

163 (11.4%)

398 (26.3%)

717 (13.3%)

Continuous variables presented as the median (interquartile interval) and categorical variables presented as the percentage. LOS, length of stay; ICU, intensive care unit. *P = 0.001 between the four subgroups no acute kidney injury, RIFLE class risk, RIFLE class injury and RIFLE class failure.

Hoste et al. Critical Care 2006 10:R73   doi:10.1186/cc4915