Table 4.

Cox proportional hazard models obtained by means of stepwise regression or backward elimination (maximum of 50 iterations).

Stepwise regression model
− 2LogL			AIC			SBC		R2
25.98			29.98			30.77		0.77
Variable	Coefficient	SE	χ2	p	− 95% CI	95% CI	HR	− 95% CI HR	95% CI HR
SOFA (1)	− 0.5083	0.1883	7.2882	0.0069	− 0.8773	− 0.1393	0.6015	0.4159	0.8700
Glutamine (Gln)	− 0.0083	0.0040	4.4167	0.0356	− 0.0161	− 0.0006	0.9917	0.9840	0.9994

Backward elimination model
− 2LogL			AIC			SBC		R2
15.04			25.04			27.03		0.91
Variable	Coefficient	SE	χ2	p	− 95% CI	95% CI	HR	− 95% CI HR	95% CI HR
APACHE II	0.1977	0.1160	2.9022	0.0885	− 0.0298	0.4251	1.2186	0.9707	1.5297
SOFA	− 1.3534	0.5261	6.6181	0.0101	− 2.3846	− 0.3223	0.2583	0.0921	0.7245
Glutamine (Gln)	− 0.0140	0.0068	4.2281	0.0398	− 0.0273	− 0.0007	0.9861	0.9731	0.9993
Septic shock: NO	− 2.2801	0.9862	5.3452	0.0208	− 4.2130	− 0.3472	0.0105	0.0002	0.4994
Sex: MALE	1.7225	0.9765	3.1112	0.0778	− 0.1915	3.6364	31.3410	0.6818	1440.6253

P-values < 0.05 and their corresponding hazard ratios (HR) are marked in bold. AIC, Akaike information criterion; SBC, Schwarz bayesian criterion; SE, standard error; HR, hazard ratio; CI, confidence interval, SOFA, sequential organ failure assessment; Gln, glutamine.