Table 3.

Multivariate Cox regression analysis of 28-day mortality in critically ill patients with acute kidney injury

Characteristic	Hazard ratio	95 % CI	P value
Age	1.013	1.005–1.020	0.002
SAPS II	1.021	1.014–1.029	<0.001
Cumulative fluid balance in 3 days	1.041	1.012–1.072	0.006
Sepsis	1.278	0.961–1.701	0.092
Postsurgery	0.760	0.595–0.971	0.028
CRRT	3.166	2.463–4.069	<0.001

CI confidence interval, CRRT continuous renal replacement therapy, SAPS II Simplified Acute Physiology Score II