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Comparison of MRI reexamination results between the two groups.
| Group (n) | Normal (%) | Grade I signal (%) | Grade II signal (%) | Grade III signal (%) |
|---|---|---|---|---|
| Observation (31) | 18 (58.1) | 4 (12.9) | 5 (16.1) | 4 (12.9) |
| Control (37) | 21 (56.8) | 7 (18.9) | 5 (13.5) | 4 (10.8) |
| Z | -0.082 | |||
| P | 0.934 |
