| Group | Participants | Age | Height | Weight | BMI |
| (n) | (years) | (m) | (kg) | (kg・m−2) | |
| Concrete operational | 30 | 7.1 ± 0.4 | 1.34 ± 0.1 | 31.9 ± 4.6 | 17.9 ± 2.9 |
| Formal operational | 30 | 12.6 ± 0.7 | 1.58 ± 0.1 | 48.8 ± 13.5 | 19.2 ± 3.6 |
| Down’s Syndrome | 30 | 12.3 ± 0.9 | 1.40 ± 0.1 | 40.8 ± 5.4 | 20.9 ± 3.1 |