Table 6.

Logistic regression model: risk factors for ICU mortality (n = 396)

Covariates associated with ICU mortality	Coefficient	Odds ratio	95% Confidence interval	P-value
Proteinuria	0.659	1.932	1.000 to 3.734	0.050
Maximum RIFLE	0.828	2.289	1.577 to 3.322	< 0.001
Comorbidities	2.446	11.545	3.986 to 33.440	< 0.001
Age	0.065	1.068	1.029 to 1.108	< 0.001
TBSA	0.462	1.587	1.421 to 1.772	< 0.001

RIFLE, Risk, Injury, Failure, Loss, End Stage classification;

SOFA, sequential organ failure assessment; TBSA, total burn surface area. Covariates selection: Age, TBSA, ACS, inhalation injury, vasopressor in the first 48 h, comorbidities, sepsis during ICU stay, proteinuria, maximum RIFLE

Variables coding: Proteinuria 1: (-), 2: (±) or (+), 3: ≥ (++); Maximum RIFLE: 1: No-AKI, 2: Risk, 3: Injury, 4: Failure + loss + end stage

There was no interaction between proteinuria and RIFLE.