Table 1.

Incidence of acute renal failure classified by the WHO 2006 and RIFLE* criteria.

Criteria	No. (%)
(a) WHO criteria (n = 257)
No ARF†	142 (55.3)
ARF†	115 (44.7)
(b) RIFLE* criteria (n = 257)
No AKI‡	67 (26.1)
Any RIFLE*	190 (73.9)
Risk	40 (15.6)
Injury	43 (16.7)
Failure	107 (41.6)

*RIFLE: risk, injury, failure, loss, and end-stage renal failure. ^†ARF: acute renal failure. ^‡AKI: acute kidney injury.