Multicenter study of endoscopic preoperative biliary drainage for malignant distal biliary obstruction

Table 4 Univariate and multivariate competing risk regression analyses to identify risk factors for plastic stent dysfunction in 253 patients who underwent endoscopic preoperative plastic stent placement

	Univariate analysis		Multivariate analysis
	SHR (95%CI)	P value	SHR (95%CI)	P value
Sex, male	1.00 (0.65-1.55)	0.993
Age > 70 yr	1.15 (0.76-1.74)	0.509
Performance status ≥ 1	0.84 (0.49-1.45)	0.534
Primary cancer
Biliary tract	Reference
Pancreas	1.27 (0.81-1.99)	0.303
Ampullary	0.83 (0.39-1.79)	0.637
Primary tumor size > 20 mm	1.10 (0.72-1.69)	0.657
Length of biliary stricture > 20 mm	1.01 (0.66-1.54)	0.957
Diameter of proximal bile duct > 15 mm	0.85 (0.56-1.28)	0.432
Tumor invasion into duodenum	1.10 (0.72-1.67)	0.659
Cholangitis on admission	0.79 (0.41-1.52)	0.479
Total bilirubin ≥ 8 mg/dL	1.32 (0.87-2.00)	0.192	1.43 (0.94-2.18)	0.096
Diameter of biliary stent/catheter
5-6 Fr	Reference
7-7.5 Fr	0.76 (0.37-1.56)	0.446
8.5-10 Fr	0.67 (0.31-1.46)	0.314
Pig-tailed tip	1.73 (1.14-2.63)	0.010	1.72 (1.13-2.64)	0.012

PS: Plastic stent; SHR: Subdistribution hazard ratio.