Table 1.
Patient characteristics
| Group 1 (n = 12) | Group 2 (n = 33) | Total (n = 45) | |
|---|---|---|---|
| Age (mean ± SD) (years) | 64.25 ± 9.6* | 71.12 ± 9.2* | 69.3 ± 9.7 |
| Gender | |||
| Male | 8 | 9 | 17 |
| Female | 4 | 24 | 28 |
| Ratio [m:f] | 2:1 | 1:2.7 | 1:1.6 |
| Number of treated segments | |||
| 1 | 4 | 14 | 18 |
| 2 | 8 | 19 | 27 |
| ASA | |||
| Unknown | 0 | 1 | 1 |
| ASA 1 | 3 | 2 | 5 |
| ASA 2 | 8 | 19 | 27 |
| ASA 3 | 1 | 11 | 12 |
| Complications | |||
| General | 2 (anesthesia-related) | 2 (anesthesia-related) | 4 |
| Surgical | 0 | 4** | 4 |
* Difference between groups not statistically significant at p-level < 0.05
** Four dural leakages, one of them with soft tissue infection