Table 3.
Analysis of Factors Affecting Stent Patency According to Cox Regression Analysis
| Factor | Univariable analysis | Multivariable analysis | |||
|---|---|---|---|---|---|
| HR (95% CI) | p-value | HR (95% CI) | p-value | ||
| Obstruction level | |||||
| Proximal CBD vs mid CBD | 1.194 (0.796–1.791) | 0.391 | 1.241 (0.820–1.880) | 0.308 | |
| Proximal CBD vs distal CBD | 1.411 (0.961–2.073) | 0.079 | 1.161 (0.735–1.834) | 0.522 | |
| Diagnosis (BTC vs non-BTC) | 1.153 (0.092–1.473) | 0.257 | 1.273 (0.962–1.684) | 0.091 | |
| SEMS type (uncovered vs covered) | 0.657 (0.501–0.862) | 0.002 | 0.667 (0.502–0.885) | 0.005 | |
| SEMS length | 1.007 (0.891–1.137) | 0.914 | 1.047 (0.918–1.194) | 0.492 | |
| Stent level (suprapapillary vs transpapillary) | 0.911 (0.665–1.247) | 0.560 | 0.729 (0.512–1.038) | 0.079 | |
| Duodenal obstruction | 1.352 (0.946–1.933) | 0.098 | 1.286 (0.855–1.936) | 0.227 | |
| MBO within 2 cm from AOV | 1.529 (1.186–1.197) | 0.001 | 1.447 (1.101–1.901) | 0.008 | |
HR, hazard ratio; CI, confidence interval; CBD, common bile duct; BTC, biliary tract cancer; SEMS, self-expandable metal stent; MBO, malignant biliary obstruction; AOV, ampulla of Vater.