Table 4.

Univariate and multivariate Cox regression analysis of 1-year postoperative mortality

Univariate analysis						Multivariate analysis
	β	SE	Z	P value	HR(95%CI)	β	SE	Z	P value	HR(95%CI)
Surgical approach	-0.332	0.690	0.232	0.630	0.717(0.185,2.774)
Gender	5.122	2.937	3.041	0.081	167.619(0.530, 52980.880)
Age	0.313	0.070	19.907	0.000	1.368(1.192,1.570)	0.227	0.084	7.283	0.007	1.255(1.064，1.479)
BMI	0.576	0.132	19.138	0.000	1.779(1.375,2.304)
SMI	0.272	0.054	25.475	0.000	1.313(1.181,1.460)
Operation time	0.054	0.010	27.554	0.000	1.056(1.035,1.077)
Blood loss	0.004	0.001	23.309	0.000	1.004(1.002,1.006)
Incision length	0.385	0.201	3.684	0.055	1.469(0.992,2.177)
Blood transfusion	0.006	0.001	34.267	0.000	1.006(1.004,1.008)
Postoperative time to ambulation	0.031	0.008	14.121	0.000	1.032(1.015,1.049)
Hospitalization days	0.383	0.069	30.445	0.000	1.467(1.280,1.681)
Hemoglobin drop	-0.110	0.041	7.295	0.007	0.896(0.827,0.970)
Albumin drop	-0.436	0.124	12.380	0.000	0.646(0.507,0.824)
Complications	4.261	1.056	16.294	0.000	70.878(8.954,561.072)	1.811	1.241	2.129	0.145	6.115(0.537,69.614)
Revisions	3.786	0.748	25.592	0.000	44.093(10.169,191.184)