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Baseline characteristics
| Parameter | Overall |
|---|---|
| Number of patients | 56 |
| Gender | |
| Female, n (%) | 27 (48.2%) |
| Male, n (%) | 29 (51.8%) |
| Age, mean (SD, range) | 64.2 (11) (31–87) |
| BMI, mean (SD, range) | 31 (5) (21–44) |
| Mean number of screws/case | 6 |
| Mean number of vertebrae | 3.2 |
