Table 2.
Patient group of factorial design
| Group | L | N | Total |
|---|---|---|---|
| A | 10 | 12 | 22 |
| P | 9 | 13 | 22 |
| Total | 19 | 25 | 44 |
A anterior decompression and fusion, P posterior laminectomy with fusion, L hypointensity on MRI, N no signal intensity on MRI
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