Types | Numbers (n = 95) | Percentages (%) | |
Location | Unilateral | 26 | 27.36 |
Bilateral | 69 | 72.64 | |
L4 | 12 | 12.64 | |
L5 | 32 | 33.68 | |
| S1 | 35 | 36.84 |
Time | Not specified | 7 | 7.36 |
Mechanical | 57 | 60 | |
Nightly | 17 | 17.90 | |
Mixt | 6 | 6.32 | |
| Not specified | 15 | 15.78 |