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Numbness degree on day 1 and at 2 y after operation between the two groups (n(%)).
| Time | Hole group (n = 25) | Notch group (n = 29) | χ 2 | P (between the two groups) |
|---|---|---|---|---|
| 1 d after operation | 2.782 | 0.356 | ||
| I | 0 (0%) | 0 (0%) | ||
| II | 15 (60%) | 5 (17.2%) | ||
| III | 10 (40%) | 23 (79.3%) | ||
| IV | 0 (0%) | 1 (3.4%) | ||
| 2 y after operation | 2.581 | 0.461 | ||
| I | 11 (44%) | 17 (58.6%) | ||
| II | 11 (44%) | 10 (34.4%) | ||
| III | 3 (12%) | 2 (6.9%) | ||
| IV | 0 (0%) | 0 (0%) | ||
| χ2 | 16.697 | 39.237 | ||
| P | <0.001 | <0.001 |
