Perioperative characteristics.
| Characteristic | Total (n = 335) | No Arthroplasty (n = 310) | Arthroplasty (n = 25) | P Valuea |
| Spinal pathology | ||||
| Recurrent herniated nucleus pulposus | 12.8% (43) | 13.5% (42) | 4.0% (1) | 0.110 |
| Degenerative spondylolisthesis | 51.6% (148) | 49.8% (131) | 70.8% (17) | 0.049 |
| Isthmic spondylolisthesis | 33.8% (96) | 34.6% (90) | 25.0% (6) | 0.341 |
| Degenerative scoliosis | 10.8% (36) | 10.0% (31) | 20.0% (5) | 0.120 |
| Number of levels | 0.283 | |||
| Single | 90.1% (302) | 90.7% (281) | 84.0% (21) | |
| Multilevel | 9.9% (33) | 9.3% (29) | 16.0% (4) | |
| Operative time, min, mean ± SD | 142.6 ± 49.4 | 142.6 ± 48.9 | 142.3 ± 57.4 | 0.978 |
| Estimated blood loss, mL, mean ± SD | 55.8 ± 35.9 | 55.0 ± 33.8 | 66.7 ± 56.9 | 0.126 |
| Length of stay, h, mean ± SD | 38.1 ± 26.2 | 38.1 ± 26.3 | 38.3 ± 24.7 | 0.981 |
Note: Boldface indicates significance.
↵a P values calculated using χ 2 test or t test.