| No. of VUR patients/family | No. of families | Maternal transmission | Paternal transmission | Unknown transmission |
| 2 affected/family | 41 | 12 | 7 | 1 unknown side, 21 only sibs |
| 3 affected/family | 18 | 7 | 8 | 3 both sides |
| 4 affected/family | 4 | 4 |
|
|
| 5 affected/family |
|
|
|
|
| 6 affected/family | 3 | 2 |
| 1 both sides |
| Total number | 66 | 25 | 15 | 26 |