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Number of subjects with various types of longitudinal arching depending on age and gender among boys (Ky index)
| Age (years) | Boys | |||||
|---|---|---|---|---|---|---|
| Ky L | Ky R | |||||
| h | n | f | h | n | f | |
| 3–6 | 31 | 18 | 19 | 34 | 16 | 18 |
| 7 | 37 | 7 | 11 | 38 | 7 | 10 |
| 8 | 52 | 24 | 6 | 60 | 15 | 7 |
| 9 | 42 | 33 | 5 | 52 | 21 | 6 |
| 10 | 33 | 15 | 11 | 32 | 17 | 10 |
| 11 | 51 | 21 | 6 | 55 | 18 | 5 |
| 12 | 62 | 30 | 7 | 66 | 29 | 4 |
| 13 | 21 | 18 | 4 | 22 | 17 | 4 |
L left foot, R right foot, h number of high-arched feet, n number of normal feet, f number of flat feet
