Table 2. Mean (SD) and median values of COP parameters taking into account sex and body height categories determined by the WHO, and significance levels from the Mann-Whitney U test.
| Body height categories determined by the WHO | COP parameters | Girls | Boys |
p value |
||
|---|---|---|---|---|---|---|
| Mean±SD | Me | Mean±SD | Me | |||
| 1 (n = 163) |
SP [mm] | 517.7±171.33 | 503.0 | 621.2±186.60 | 602.4 | <0.001 |
| V [mm/s] | 18.0±5.90 | 17.6 | 21.6±6.50 | 20.8 | <0.001 | |
| AoE [mm2] | 792.4±463.35 | 678.6 | 1165.0±636.23 | 1046.0 | <0.001 | |
| LoEAP [mm] | 32.5±11.73 | 30.6 | 35.5±12.04 | 35.0 | 0.049 | |
| LoEML [mm] | 30.6±14.77 | 28.2 | 40.7±16.31 | 38.2 | <0.001 | |
| 0 (n = 262) |
SP [mm] | 570.6±177.45 | 549.7 | 644.3±197.69 | 630.1 | 0.002 |
| V [mm/s] | 19.8±6.15 | 19.1 | 22.5±7.09 | 22.0 | 0.001 | |
| AoE [mm2] | 886.9±533.30 | 758.5 | 1029.7±555.79 | 947.9 | 0.021 | |
| LoEAP [mm] | 32.6±11.34 | 31.2 | 35.2±12.58 | 33.1 | 0.11 | |
| LoEML [mm] | 33.8±14.42 | 31.7 | 36.8±15.35 | 35.2 | 0.16 | |
| -1 (n = 10) |
SP [mm] | 430.4±81.81 | 403.2 | 612.2±225.63 | 578.2 | No test was performed due to the small size of the group |
| V [mm/s] | 15.0±2.87 | 14.0 | 21.3±7.86 | 20.2 | ||
| AoE [mm2] | 652.6±275.18 | 651.5 | 679.7±345.72 | 687.6 | ||
| LoEAP [mm] | 27.1±11.10 | 24.9 | 28.4±12.22 | 25.9 | ||
| LoEML [mm] | 30.4±3.75 | 31.4 | 29.9±9.47 | 29.1 | ||
Note: n—number of children; SD–standard deviation; Me–median; SP–sway path length of COP; V–average velocity of COP; AoE–area of the ellipse; LoEAP–length of the ellipse in the anterior-posterior direction; LoEML–length of the ellipse in the medial-lateral direction; (1) tall-statured children; (0) normal-statured children; (-1) low-statured children. Statistical significance was set at p<0.05.