Perioperative characteristics.
| Characteristic | Nonobese (n = 116) | Obese I (n = 70) | Severe + Morbid (n = 61) | P Valuea |
| Spinal pathology, % (n) | ||||
| Degenerative spondylolisthesis | 37.9% (47) | 36.5% (27) | 41.7% (30) | 0.798 |
| Isthmic spondylolisthesis | 19.4% (24) | 16.2% (12) | 20.8% (15) | 0.763 |
| Recurrent herniated nucleus pulposus | 29.0% (36) | 23.0% (17) | 22.2% (16) | 0.480 |
| Scoliosis | 0.8% (1) | 2.7% (2) | 0.0% (0) | 0.270 |
| Operative time, min, mean ± SD | 120.0 ± 34.3 | 125.3 ± 27.6 | 140.1 ± 48.4 | <0.001 |
| Estimated blood loss, mL, mean ± SD | 56.2 ± 27.8 | 51.7 ± 22.2 | 60.3 ± 30.3 | 0.160 |
| Length of stay, h, mean ± SD | 46.1 ± 27.2 | 49.4 ± 29.6 | 53.0 ± 30.9 | 0.282 |
| Day of discharge, % (n) | 0.097 | |||
| POD 0 | 13.3% (16) | 10.0% (7) | 5.6% (4) | |
| POD 1 | 30.8% (37) | 27.1% (19) | 35.2% (25) | |
| POD 2 | 30.0% (36) | 35.7% (25) | 22.5% (16) | |
| POD 3 | 18.3% (22) | 18.6% (13) | 29.6% (21) | |
| POD 4 | 2.5% (3) | 0.0% (0) | 4.2% (3) | |
| POD 5 | 0.0% (0) | 0.0% (0) | 1.4% (1) | |
| POD 6 | 0.0% (0) | 2.9% (2) | 0.0% (0) | |
| POD 7 | 0.0% (0) | 0.0% (0) | 1.4% (1) |
Abbreviation: POD, postoperative day of discharge.
Note: Boldface indicates statistical significance.
↵a P value calculated using χ2 analysis or Student’s t test.