Endoscopic management of occluded metal biliary stents: Metal versus 10F plastic stents

Table 4 Univariate analysis of factors associated with time to second stent occlusion

Factor	Time to second stent occlusion, median (d)	P value
Sex		0.273
Male (n = 37)	103
Female (n = 19)	137
Age at initial SEMS insertion (yr)		0.697
≥ 65 (n = 31)	137
< 65 (n = 25)	104
Diagnosis		0.363
Pancreatic cancer (n = 21)	137
Others (n = 35)	103
Biliary drainage prior to initial SEMS insertion		0.924
Yes (n = 24)	137
No (n = 32)	104
Cause of initial SEMS occlusion		0.008
Ingrowth (n = 44)	101
Not ingrowth (n = 12)	268
Anti-cancer therapy		0.444
Yes (n = 36)	137
No (n = 20)	103
Cholangitis on initial SEMS occlusion		0.244
Yes (n = 33)	103
No (n = 23)	186
Covered initial SEMS		0.918
Yes (n = 4)	186
No (n = 52)	104

Results of log-rank test. SEMS: Self-expandable metal stent.