| Variable | Group K1 (n = 25) | Group K2 (n = 25) | Group S (n = 25) |
| Age (year) | 9.75 ± 2.3 | 8.9 ± 2.3 | 9.6 ± 2.5 |
| Weight (kg) | 22.3 ± 6.0 | 21.2 ± 6.1 | 24.2 ± 6.4 |
| Sex (M/F) | 17/8 (68/32) | 14/11 (56/44) | 15/10 (60/40) |