Table 1. Comparison of patient characteristics between good and poor outcome groups.
| Variable | Good (n = 50) | Poor (n = 38) | P-value |
|---|---|---|---|
| Age at operation (yr) | 59.5 ± 8.5 | 63.7 ± 8.4 | 0.024 |
| Male sex (n, %) | 33 (66.0%) | 19 (50.0%) | 0.131 |
| Duration of symptoms (mo) | |||
| ＜3 | 33 | 10 | 0.001 |
| 3–6 | 12 | 15 | |
| >6 | 5 | 13 | |
| Preoperative MMT score | 2.4 ± 1.0 | 1.9 ± 1.1 | 0.021 |
| Atrophy type | |||
| Proximal type | 35 | 17 | 0.017 |
| Distal type | 15 | 21 | |
| Levels involved | 1.7 ± 0.7 | 2.0 ± 0.9 | 0.086 |
| Compression type | |||
| VNR | 31 | 14 | 0.001 |
| AH | 10 | 17 | |
| VNR + AH | 9 | 7 | |
| Low signal on T1 MRI | 3 (6.0%) | 2 (5.3%) | 1.000 |
| High signal on T2 MRI | 10 (20.0%) | 11 (29.0%) | 0.366 |
| Surgical approach | |||
| Anterior | 39 | 30 | 0.915 |
| Posterior | 11 | 8 | |
MMT: manual muscle testing; AH: anterior horn; VNR: ventral nerve root; MRI: Magnetic resonance imaging; mo: month; yr: year.