Table 4. Predictors of outcome for 28-day non-survivors.

Characteristic	Univariate HR (95% CI)	p value	Multivariate HR (95% CI)	p value
Age (per 10)	1.582 (1.227–2.041)	<0.001	1.546 (1.174–2.035)	0.0019
APACHE II score (per 10)	1.839 (1.155–2.928)	0.010	1.627 (0.992–2.670)	0.0539
SOFA score (per 5)	1.311 (0.807–2.131)	0.274
Acute lung injury score	0.725 (0.334–1.574)	0.415
Mean arterial pressure	0.987 (0.967–1.007)	0.213
BMI	0.955 (0.885–1.031)	0.237
VT, ml/kg PBW	0.885 (0.665–1.176)	0.399
PaO2/FiO2, (mmHg)	1.001 (0.995–1.007)	0.655
pH value (per 0.1)	0.788 (0.479–1.296)	0.347
NT-proBNP (per 100)	1.006 (1.002–1.010)	0.002	1.009 (1.004–1.013)	0.0001
Number of comorbidities	0.983 (0.661–1.463)	0.934
Number of organ dysfunctions	1.302 (0.950–1.785)	0.101