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Showing preoperative and postoperative prevertebral soft tissue swelling at C2 and C6 vertebrae
| C2 preop PVSTS (mm) | C2 postop PVSTS (mm) | C2 intragroup P value | C6 preop PVSTS (mm) | C6 postop PVSTS (mm) | C6 intragroup P value | |
| Group 1 | 4.7 ± 0.2 | 5.5 ± 0.4 | 0.08 | 11.1 ± 0.5 | 14.9 ± 0.6 | 0.285 |
| Group 2 | 4.5 ± 0.5 | 4.9 ± 0.3 | 0.107 | 12.8 ± 0.5 | 14.8 ± 0.5 | 0.873 |
| Intergroup P value | 0.172 | 0.212 | 0.127 | 0.946 |
PVSTS: Prevertebral soft tissue swelling.
