Table 4. Multivariate analysis for stent patency > 90 days.

Factors	Hazard ratio	95 % CI	P value
Age	0.966	0.868 – 1.089	0.5748
Sex	1.119	0.179 – 6.984	0.9038
Undrained area cholangitis	0.559	0.085 – 3.668	0.5446
Above stent placement	33.638	2.922 – 387.303	0.0048

Above stent: stent placed above the sphincter of Oddi95 % CI: 95 % confidence interval