Table 5.
Risk Factors Affecting Primary and Overall Success Rates
| Primary | Overall | |||
|---|---|---|---|---|
| HR | p-value | HR | p-value | |
| Stent type | ||||
| Mesh | 1.000 | ─ | 1.000 | ─ |
| Thermo-expandable | 0.393 | 0.052 | 0.680 | 0.468 |
| Age (yr) | 0.983 | 0.298 | 0.966 | 0.095 |
| Gender | ||||
| Male | 1.000 | ─ | 1.000 | ─ |
| Female | 0.469 | 0.131 | 0.640 | 0.462 |
| Stricture location | ||||
| Pelvic ureter | 1.000 | ─ | 1.000 | ─ |
| Non-pelvic uretera | 2.631 | 0.062 | 4.203 | 0.030* |
| Stricture length (cm) | ||||
| ≤10 cm | 1.000 | ─ | 1.000 | ─ |
| > 10 cm | 2.925 | 0.077 | 1.789 | 0.430 |
| Stent length | 0.138 | 0.058 | ||
| < 10 cm | 1.000 | ─ | 1.000 | ─ |
| 10–15 cm | 0.425 | 0.144 | 0.388 | 0.140 |
| > 15 cm or multipleb | 0.185 | 0.047* | 0.111 | 0.018* |
| Prior radiation therapy | ||||
| No | 1.000 | ─ | 1.000 | ─ |
| Yes | 2.155 | 0.198 | 5.412 | 0.048* |
| Previous PCN | ||||
| No | 1.000 | ─ | 1.000 | ─ |
| Yes | 4.014 | 0.003* | 3.064 | 0.035* |
| Balloon dilatation | ||||
| No | 1.000 | ─ | 1.000 | ─ |
| Yes | 0.980 | 0.963 | 0.978 | 0.970 |
*Statistically significant (p < 0.05)
aupper ureteral stricture only
bmore than two stents
HR hazard ratio, PCN percutaneous nephrostomy