Perioperative Data for 1-Level and 2-Level Subgroups
| 1-Level | 2-Level | Significance | |
|---|---|---|---|
| Blood loss (ml) | 59.0 | 79.2 | .05 < P < .09 |
| Operative time (min) | 61.9 | 97.8 | P < .001 |
| Length of hospitalization (days) | 1.89 | 2.44 | P < .05 |
The mean blood loss, operative time and length of hospitalization were all less in single-level cases (P < .05; f-test).