| Variables | D groupe (60) | P groupe (30) | P value | Interval of confidence 95% | RR |
| Hypoaesthesia | 47 | 06 | 0.001 | 0.25 [0.12 - 0.52] | 0.25 |
| Pain feeling | 41 | 08 | 0.001 | 0.39 [0.21 - 0.72] | 0.39 |
| Mild pain (2/10) | 21 | 06 | 0.002 | ||
| Moderate pain (4/10) | 18 | 01 |
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| Electric shocks | 34 | 07 | 0.012 |
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| Numbness | 30 | 03 | 0.002 |
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