Number of participants and average age in different categories of fusion grading
| Count | Mean | SD (95% CI) | |
|---|---|---|---|
| I | 72 | 15.64 | 0.74 (15.5 to 15.7) |
| II | 177 | 16.29 | 0.90 (16.2 to 16.4) |
| III | 45 | 16.78 | 0.98 (16.5 to 17.1) |
| IV | 57 | 17.21 | 0.93 (17.0 to 17.5) |
| V | 117 | 17.98 | 1.03 (17.8 to 18.2) |
| VI | 28 | 18.27 | 0.91 (17.9 to 18.7) |