Table 3.

Prognostic factors for stent patency

	Univariate analysis		Multivariate analysis
	HR (95%CI)	P value	HR (95%CI)	P value
Age (> 70 yr)	1.792 (0.731-4.391)	0.202
Sex (M)	0.998 (0.418-2.384)	0.996
ECOG PS (> 2)	1.436 (0.590-3.492)	0.425
Underlying malignancy (pancreatic cancer)	0.512 (0.205-1.276)	0.151
Stage (> III)	0.955 (0.345-2.648)	0.930
Obstruction site		0.414
Proximal of 2nd portion	1.000
2nd portion	0.552 (0.211-1.441)	0.225
Distal of 2nd portion	0.486 (0.116-2.042)	0.325
Stent
Covered	2.586 (1.046-6.388)	0.040	2.586 (1.046-6.388)	0.040
Length (> 100 mm)	1.261 (0.480-3.307)	0.638
Diameter (> 18 mm)	0.664 (0.221-1.997)	0.466
Chemotherapy after stent insertion	0.425 (0.125-1.449)	0.172
Chemotherapy before stent insertion	0.261 (0.059-1.158)	0.077
Biliary drainage before stent insertion	0.799 (0.306-2.086)	0.646

ECOG PS: Eastern cooperative oncology group performance status.