Table 1 The association between the occurrence of loosening and different continuous variables (Mann–Whitney U test)
Whole study cohort | Patients with no evidence of loosening | Patients with evidence of loosening | P-value | |
|---|---|---|---|---|
Age (year) | 18.5 ± 3 | 18.6 ± 3 | 18.5 ± 3 | 0.878 |
Preoperative Cobb, major curve (°) | 54 ± 11 | 53 ± 11 | 56 ± 11 | 0.288 |
Postoperative Cobb, major curve (°) | 16 ± 7 | 16 ± 7 | 16 ± 7 | 0.804 |
Correction rate (%) | 70 ± 11 | 70 ± 11 | 70 ± 12 | 0.816 |
Misplacement rate (%) | 12 ± 11 | 11 ± 11 | 14 ± 11 | 0.254 |
Time after surgery | 24 ± 3 | 24 ± 3 | 24 ± 3 | 0.671 |