| Clinical signs | Number | Percentage |
| Paresthesia* |
|
|
| Burning | 81 | 47.6 |
| Tingling | 68 | 40.0 |
| Numbness | 47 | 27.6 |
| Grade of sensory symptoms |
|
|
| Grade 1 | 80 | 47.1 |
| Grade 2 | 59 | 34.7 |
| Grade 3 | 31 | 18.2 |
| Alteration of vibratory sensation | 47 | 27.6 |
| Diminution or abolition of ankle reflex | 149 | 87.6 |