| Parameter | Outcome | Total | p-value (<0.05) | |
| Failed | Successful | |||
| Age (yrs) |
|
|
|
|
| 65 - 69 | 1 | 19 | 20 | 0.446 |
| 70 - 74 | 2 | 12 | 14 | |
| 75+ | 2 | 7 | 9 | |
| Number of procedures |
|
|
|
|
| 1 | 2 | 34 | 36 | 0.004849 |
| 2 | 3 | 4 | 7 | |
| Number of strictures |
|
|
|
|
| 1 | 3 | 33 | 36 | 0.126 |
| 2 | 2 | 5 | 7 | |