Number (%) of participants in relation to grading of fusion in the different age groups
| 14 years | 15 years | 16 years | 17 years | 18 years | 19 years | |
|---|---|---|---|---|---|---|
| I | 11 (52.4%) | 40 (32.0%) | 16 (12.3%) | 5 (4.3%) | 0 | 0 |
| II | 10 (47.6%) | 60 (48.0%) | 65 (50.0%) | 37 (32.2%) | 5 (5.9%) | 0 |
| III | 0 | 11 (8.8%) | 16 (12.3%) | 10 (8.7%) | 8 (9.4%) | 0 |
| IV | 0 | 8 (6.4%) | 15 (11.5%) | 21 (18.3%) | 13 (15.3%) | 0 |
| V | 0 | 6 (4.8%) | 17 (13.1%) | 31 (27.0%) | 49 (57.6%) | 14 (70.0%) |
| VI | 0 | 0 | 1 (0.8%) | 11 (9.6%) | 10 (11.8%) | 6 (30.0%) |
| Total | 21 | 125 | 130 | 115 | 85 | 20 |