Perioperative characteristics by depressive symptom subgroup.
| Characteristics | Minimal (n = 109) | Mild (n = 64) | Moderate to Severe (n = 43) | P Valuea |
| Spinal pathology | ||||
| Herniated nucleus pulposus | 71.6% (78) | 62.5% (40) | 76.7% (33) | 0.102 |
| Foraminal stenosis | 58.7% (64) | 57.8% (37) | 72.1% (31) | 0.254 |
| Spinal stenosis | 89.0% (97) | 92.2% (59) | 90.7% (39) | 0.787 |
| Decompression | 0.212 | |||
| Single level | 77.8% (84) | 85.7% (54) | 88.4% (38) | |
| Multilevel | 22.2% (24) | 14.3% (9) | 11.6% (5) | |
| Operative time, min | 44.7 ± 16.3 | 45.5 ± 19.5 | 46.1 ± 19.0 | 0.907 |
| Estimated blood loss, mL | 26.7 ± 7.9 | 26.2 ± 6.9 | 26.1 ± 5.9 | 0.863 |
| Length of stay, h | 7.4 ± 13.6 | 6.8 ± 9.5 | 6.7 ± 10.4 | 0.927 |
Note: Data presented as (%) n or mean ± SD.
↵a P value calculated using χ 2 test or analysis of variance.