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.