Table 2.
Results of the anesthetic block according to the length of the pain-free interval
| N =40 | Positive blocks | Negative blocks |
| Free interval >3 months (16) | 8 (50%) | 8 (50%) |
| Free interval <3 months (24) | 6 (25%) | 18 (75%) |
Fischer’s test: 0.176
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