Distribution of the grade of fusion in the four U-17 competitions and in the different age groups of a normative population8
| Grade of fusion | FIFA U-17 | AFC U-17 | Normative population8 | ||||
|---|---|---|---|---|---|---|---|
| Finland 2003 | Peru 2005 | Japan 2004 | Singapore 2006 | 16–17 | 17–18 | 18–19 | |
| FIFA, Fédération Internationale de Football Association; AFC, Asian Football Confederation. | |||||||
| Values in parentheses are percentages. | |||||||
| I | 7 (15) | 0 | 3 (6) | 0 | 16 (12) | 5 (4) | 0 |
| II | 11 (23) | 4 (9) | 11 (23) | 5 (10) | 65 (50) | 37 (32) | 5 (6) |
| III | 3 (6) | 5 (11) | 4 (8) | 6 (13) | 16 (12) | 10 (9) | 8 (9) |
| IV | 2 (4) | 4 (9) | 9 (19) | 15 (31) | 15 (11) | 21 (18) | 13 (15) |
| V | 8 (17) | 24 (53) | 10 (21) | 19 (40) | 17 (13) | 31 (27) | 49 (58) |
| VI | 17 (35) | 8 (18) | 11 (23) | 3 (6) | 1 (1) | 11 (10) | 10 (12) |
| Total | 48 | 45 | 48 | 48 | 130 | 115 | 85 |