Table 8. Cox Proportional Hazard Models.

Variable	Single-variate analyses			Multivariate analysis
	Crude HR	95% CI	P value	AHR	95% CI	P value
Age (year)	1.03	1.02 - 1.04	< 0.001	1.04	1.02 - 1.06	< 0.001
Body mass index (kg/m2)	0.96	0.93 - 0.99	0.04	0.98	0.94 - 1.03	0.46
Body Temperature (°C)	0.93	0.80 - 1.09	0.39
WBC (/uL)	1.00	0.99 - 1.00	0.31
CRP (mg/dL)	1.07	1.03 - 1.10	< 0.001	1.00	0.95 - 1.06	0.86
Hb (g/dL)	0.88	0.84 - 0.92	< 0.001	1.03	0.94 - 1.14	0.48
ALT (IU/L)	1.00	1.00 - 1.01	0.001	1.00	0.99 - 1.01	0.10
BUN (mg/dL)	1.02	1.01 - 1.02	< 0.001	1.02	1.01 - 1.03	< 0.001
Cr (mg/dL)	1.04	0.98 - 1.11	0.23	0.94	0.84 - 1.06	0.30
Albumin (g/dL)	0.64	0.55 - 0.76	< 0.001	0.51	0.36 - 0.73	< 0.001
Total cholesterol (mg/dL)	0.99	0.99 - 1.00	0.001	1.00	0.99 - 1.00	0.90
Male	1.56	1.31 - 1.86	< 0.001	2.01	1.49 - 2.92	< 0.001
Previous history of pneumonia	1.42	1.16 - 1.73	0.001	1.10	0.79 - 1.54	0.56
level of independent living of demented elderly	1.05	0.97 - 1.15	0.25
Hypertension	1.17	0.98 - 1.39	0.09
Dyslipidemia	1.20	0.91 - 1.60	0.20
Arteriosclerosis obliterans	1.21	0.78 - 1.88	0.39
Able to take perorally	0.76	0.63 - 0.92	0.004	0.82	0.59 - 1.12	0.21
Diabetes	1.61	1.29 - 1.99	0.10	2.17	1.46 - 3.25	< 0.001
Previous history of cardiovascular disease	1.45	1.16 - 1.81	0.001	1.09	0.73 - 1.65	0.67
Extremely poor nutritional status	1.40	1.13 - 1.73	0.002	1.31	0.92 - 1.88	0.14
Fasting period prior to operation	1.05	0.98 - 1.11	0.14
Alzheimer’s dementia	0.93	0.78 - 1.12	0.47
Cerebrovascular dementia	1.17	0.98 - 1.41	0.08
Dementia with Lewy bodies	0.81	0.40 - 1.63	0.55
Level of independent living
I	-	-
IIa/IIb	0.59	0.34 - 1.00
IIIa/IIIb	-	-
M	1.03	0.72 - 1.47

*Adjusted for all the variables listed in the table. HR, hazard ratio; CI, confidence interval; AHR, adjusted hazard ratio.