Table 2.
Number of screws per level and group
| Instrumented SVB | Freehand (n = 22) | Robot assisted (n = 23) | Total (n = 45) | χ2 | P |
|---|---|---|---|---|---|
| S1 (single) | 13 | 9 | 22 | 4.760 | 0.093 |
| S2 (single) | 9 | 10 | 19 | ||
| S1 (double) | 0 | 4 | 4 |
SVB: Sacral vertebral body.
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