| Number of previous repairs―Figure 13 | Number of patients. (%) 104 = 100% |
| 0 | 75 72.11% |
| 1 | 18 17.30% |
| 2 | 5 3.32% |
| 3 | 2 1.92% |
| >4 | 2 1.92% |
| No data available | 2 1.92% |
| VVF (*6) classification―Waaldijk (*7) Type of fistulas―Figure 14 + Figure 15 | Number of patients. (%) 104 = 100% |
| Typ I: | 54 51.92% (% of all VVF) |
| VCVF (*8) | 28 26.92% (% of all VVF) |
| Typ I | 26 25.00% |