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| 4-year | 4.5-year | 5-year | 5.5-year | 6-year | 6.5-year | Total | χ2 test | |
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| χ2 | p | |||||||
| Boys | Barefoot group | n | 33 | 19 | 27 | 27 | 23 | 22 | 151 | 15.26 | 0.00* |
| (n = 299) | Ratio (%) | 54.1 | 45.2 | 54.0 | 54.0 | 38.3 | 61.1 | 50.5 | |||
| Non-barefoot group (n = 286) | n | 25 | 32 | 26 | 35 | 33 | 39 | 190 | |||
| Ratio (%) | 64.1 | 64.0 | 66.7 | 66.0 | 61.1 | 76.5 | 66.4 | ||||
| Girls | Barefoot group | n | 32 | 25 | 24 | 15 | 25 | 17 | 138 | 1.28 | 0.28 |
| (n = 253) | Ratio (%) | 59.3 | 64.1 | 43.6 | 55.6 | 54.3 | 53.1 | 54.5 | |||
| Non-barefoot group (n = 252) | n | 15 | 31 | 31 | 26 | 27 | 20 | 150 | |||
| Ratio (%) | 44.1 | 62.0 | 60.8 | 61.9 | 71.1 | 54.1 | 59.5 | ||||