Table 3.
Subgroup analysis of baseline characteristics
| Characteristics | Subgroup | p value | |
|---|---|---|---|
| D-ROM | I-ROM | ||
| Patients (n) | 31 | 29 | |
| Mean age (years) | 57.0 ± 9.3 | 54.7 ± 6.6 | 0.263 |
| Sex (female/male) | 13/18 | 11/18 | 0.752a |
| Index level (n) | |||
| C3–4 | 0 | 1 | 0.391b |
| C4–5 | 9 | 4 | |
| C5–6 | 19 | 20 | |
| C6–7 | 3 | 4 | |
| Follow up (months) | 135.2 ± 15.4 | 135.0 ± 16.4 | 0.975 |
| Overall ROM (°) | 47.1 ± 17.4 | 46.5 ± 12.8 | 0.879 |
| Index level ROM (°) | 11.2 ± 4.0 | 10.1 ± 3.9 | 0.275 |
| C2–7 angle (°) | 14.0 ± 14.9 | 11.6 ± 12.9 | 0.512 |
| FSU angle (°) | 2.3 ± 6.7 | 0.1 ± 5.2 | 0.131 |
| FSU height (%) | 222.3 ± 10.6 | 224.0 ± 15.1 | 0.626 |
| COR-x (%) | 41.2 ± 9.3 | 43.5 ± 10.0 | 0.36 |
| COR-y (%) | 69.9 ± 14.0 | 71.3 ± 11.3 | 0.673 |
atwo-sided χ2 test
btwo-sided Fisher exact test