Table 7.

Univariate and multivariate analysis of stent obstruction

	Univariate analysis			Multivariate analysis
	Hazard ratio	95% confidence interval	P value	Hazard ratio	95% confidence interval	P value
Inside stent	0.286	0.114-0.719	0.008	0.292	0.114-0.750	0.011
Preoperative chemotherapy (Yes)	2.254	0.813-6.249	0.118	1.614	0.579-4.499	0.360
Initial endoscopic treatment with cholangitis	2.267	0.741-6.934	0.151	2.530	0.807-7.934	0.111
Stent diameter 7Fr.	1.106	0.372-3.289	0.8558