. Author manuscript; available in PMC: 2014 Nov 1.

Published in final edited form as: Crit Care Med. 2013 Nov;41(11):10.1097/CCM.0b013e31829860fc. doi: 10.1097/CCM.0b013e31829860fc

Table 3.

Prevalence of RIFLE-AKI stages and mortality rates among 27,140 patients without AKI per NSQIP definition.

	Prevalence N (%)	Hospital Mortality N (%)	90-day Mortality N (%)	Mortality rate/100 PM¹ (95% CI)
All patients without NSQIP-AKI (n=27140)
No RIFLE-AKI	17613 (65%)	98 (0.6%)	457 (3%)	2.5 (2.0, 3.0)
RIFLE-AKI, all stages
RIFLE-AKI Risk	5959 (22%)	162 (3%)^*	343 (6%)^*	6.0 (5.2, 7.0)^*
RIFLE-AKI Injury	2575 (9%)	167 (6%)^*	272 (11%)^*	8.5 (7.3, 9.9)^*
RIFLE-AKI Failure	993 (4%)	173 (17%)^*	206 (21%)^*	12.7 (10.9, 14.7)^*

Mortality rate calculated as number of deaths per 100 person-months (95% Confidence Interval)

p-value<0.05 for comparing RIFLE-AKI stages to No RIFLE-AKI.