| Seat | Obilat [8] % | Our Study % | Elboukili [3] % | Arthuis [9] % |
| Cervical |
| 4 | 08 |
|
| Dorsal | 37.7 | 46 | 64 | 53.33 |
| Lumbar |
| 27 | 12 |
|
| Mixte | 24.4 | 23 | 32 | 23 |