Operative characteristics of patients undergoing lumbar decompression (n = 91).
| Operative Characteristic | Total (n = 91) |
| Spinal pathology, n (%) | |
| Herniated nucleus pulposus | 76 (83.5%) |
| Degenerative spondylolisthesis | 5 (5.5%) |
| Isthmic spondylolisthesis | 2 (2.2%) |
| Operative time (min), mean ± SE | 41.9 ± 11.8 |
| Estimated blood loss (mL), mean ± SE | 25.8 ± 6.6 |