Risk factors and survival prediction model establishment for prognosis in patients with radical resection of gallbladder cancer

Table 4 Multivariate cox regression analysis

Variable	HR	95%CI	P value
Lymph node metastasis
N1	1.12	0.39-3.22	P = 0.835
N2	1.93	1.07-3.48	P = 0.030
Degree of differentiation
Moderately differentiated	4.08	1.32-12.64	P = 0.015
Poorly differentiated	4.33	1.35-13.89	P = 0.014
Surgical margin
Positive	0.39	0.20-0.74	P = 0.004
Liver invasion
Present	1.97	0.96-4.03	P = 0.063
Extrahepatic bile duct invasion
Present	2.39	1.20-4.77	P = 0.014
Perineural invasion
Present	1.83	1.04-3.22	P = 0.036

HR: Hazard ratio.