Table 4.
Comparative summary of patients with group 1 and group 2
| Group 1 | Group 2 | P value | |
|---|---|---|---|
| Case number | 18 | 12 | 0.529‡ |
| Male | 10 | 6 | |
| Female | 8 | 6 | |
| Mean age (yrs) | 53.5 ± 16.4 | 46.8 ± 14.2 | 0.261§ |
| Follow‐Up (month) | 26.3 ± 20.9 | 31.3 ± 21.3 | 0.524§ |
| OC2A | |||
| Post‐O (°P‐S) | 14.3 ± 3.9 | 24.3 ± 6.6 | <0.001§ , † |
| Post‐O (°F‐F) | 13.9 ± 5.0 | 22.1 ± 6.4 | 0.001§ , † |
| POCA | |||
| Post‐O (°P‐S) | 111.6 ± 5.2 | 107.4 ± 11.0 | 0.166§ |
| Post‐O (°F‐F) | 114.4 ± 6.8 | 108.3 ± 11.3 | 0.075§ |
| VAS | |||
| Pre‐O | 6.4 ± 1.0 | 6.3 ± 0.8 | 0.583§ |
| Post‐O (°F‐F) | 1.9 ± 0.6** , † | 2.2 ± 0.8** , † | 0.291§ |
| JOA | |||
| Pre‐O | 13.4 ± 1.3 | 13.3 ± 1.2 | 0.820§ |
| Post‐O (°F‐F) | 15.9 ± 0.3** , † | 15.4 ± 0.5** , † | 0.072§ |
| NDI | |||
| Pre‐O | 19.6 ± 5.4 | 19.3 ± 3.9 | 0.868 |
| Post‐O (°F‐F) | 7.0 ± 2.3** , † | 11.0 ± 2.9** , † | <0.001§ , † |
| dCSA (°) | −2.3 ± 6.2 | 5.9 ± 7.5 | 0.003§ , * |
dCSA = (CSA of postoperative/soon after surgery and ambulation)‐(CSA of final follow‐up after surgery).
OC2A, occipitoaxial angle; POCA, posterior occipitocervical angle; CSA, cervical spinal angle; VAS, visual analog scale; JOA, Japanese orthopedics association score; NDI, neck disability index; Pre‐O, pre‐operation; Post‐O (P‐S), postoperative/soon after surgery and ambulation; Post‐O (F‐F), post‐operative final follow‐up.
*
Statistically significant between group 1 and group 2.
†
Statistically significant between pre‐operation and post‐operative final follow‐up.
‡
Fisher's exact test.
§
Independent‐samples t test.
**
Paired‐Samples t test.