Table 4.

The univariate and multivariate analysis for factors associated with 30-day mortality

Variable	Univariate			Multivariate
	HR	95% CI	p-value	HR	95% CI	p-value
Age	1.017	0.995–1.040	0.137	1.007	0.982–1.033	0.592
Male sex	0.953	0.526–1.727	0.875	0.807	0.439–1.484	0.490
APACHE II	1.073	1.025–1.122	0.002	1.073	1.025–1.122	0.002
RRT	1.014	0.539–1.908	0.966	0.830	0.422–1.634	0.590
Vitamin B1 and C	0.737	0.414–1.314	0.302	0.853	0.435–1.674	0.644
Steroid	0.979	0.562–1.705	0.941	1.018	0.540–1.922	0.955
Prone position	0.684	0.291–1.608	0.384	0.886	0.357–2.198	0.793

HR: hazard ratio; CI: confidence interval; APACHE: Acute Physiology and Chronic Health Evaluation; RRT: renal replacement therapy.