Description of patient population.
| Variable | n (%)a |
| Age, y, mean (SD) | 44.1 (10.5) |
| BMI, mean (SD) | 27.8 (5.7) |
| Sex | |
| Female | 158 (44.0%) |
| Male | 201 (56.0%) |
| Surgery type | |
| ALIF | 95 (26.5%) |
| TDR | 238 (66.3%) |
| Hybrid | 26 (7.2%) |
| Number of levels | |
| 1 | 256 (71.3%) |
| 2 | 94 (26.2%) |
| 3 | 9 (2.5%) |
Abbreviations: ALIF, anterior lumbar interbody fusion; BMI, body mass index; TDR, total disc replacement.
↵a Data presented as n (%) except where otherwise noted.