| Chronic apical periodontitis with a fistula | Microvascular proliferation | Total | |
| Yes | No | ||
| Yes | 1 | 5 | 6 |
|
| 2.778% | 13.889% | 16.667% |
| No | 20 | 10 | 30 |
|
| 55.556% | 27.778% | 83.333% |
| Total | 21 | 15 | 36 |
|
| 58.333% | 41.667% |
|