## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline
**Unit** & **Variable Right** & **XA** & **SD** & **K-S** & **Cr. \(\alpha\)** & **Variable Left** & **XA** & **SD** & **K-S** & **Cr. \(\alpha\)** & **t** & \(p\) \\ \hline No & R–all & 74.91 & 36.77 & + & L–all & 31.97 & 24.04 & - & 9.35 & **<0.001** \\ No & R–U12 & 47.76 & 21.08 & & L–U12 & 21.18 & 23.72 & & 9.35 & **<0.001** \\ No & R–U13 & 59.78 & 24.42 & & L–U13 & 29.72 & 19.3 & & 2.92 & **0.01** \\ No & R–U14 & 80.33 & 41.41 & & L–U14 & 36.87 & 30.97 & & 3.45 & **0.003** \\ No & R–U15 & 69.94 & 37.22 & & L–U15 & 36.31 & 28.86 & & & 2.64 & **0.019** \\ No & R–U16 & 75.56 & 32.78 & & L–U16 & 37.06 & 25.75 & & & 2.25 & **0.04** \\ No & R–U17 & 106 & 43.61 & & L–U17 & 34.46 & 19.74 & & & 3.21 & **0.005** \\ No & R–U18 & 86 & 19.43 & & L–U18 & 25.1 & 11.73 & & & 5.57 & **<0.001** \\ No & R–U19 & 97.67 & 40.27 & & L–U19 & 34.89 & 22.86 & & & 7.21 & **<0.001** \\ s & DCD\_RR–all & 9.09 & 1.04 & - & DCD\_LR–all & 9.25 & 1.13 & - & 0.92 & 3.59 & **0.007** \\ s & DCD\_RR–U12 & 10.47 & 0.92 & & DCD\_LR–U12 & 10.78 & 1 & & & \(-3.89\) & **<0.001** \\ s & DCD\_RR–U13 & 9.93 & 0.54 & & DCD\_LR–U13 & 10.08 & 0.75 & & & \(-3.17\) & **0.006** \\ s & DCD\_RR–U14 & 9.38 & 0.85 & & DCD\_LR–U14 & 9.42 & 0.65 & & & \(-0.96\) & 0.35 \\ s & DCD\_RR–U15 & 8.99 & 0.69 & & DCD\_LR–U15 & 9.4 & 0.66 & & & \(-0.44\) & 0.668 \\ s & DCD\_RR–U16 & 8.34 & 0.35 & & DCD\_LR–U16 & 8.51 & 0.42 & & & \(-4.59\) & **<0.001** \\ s & DCD\_RR–U17 & 8.38 & 0.57 & & DCD\_LR–U17 & 8.43 & 0.52 & & & \(-3.08\) & **0.007** \\ s & DCD\_RR–U18 & 8.19 & 0.33 & & DCD\_LR–U18 & 8.12 & 0.61 & & & \(-1.01\) & 0.332 \\ s & DCD\_RR–U19 & 8.07 & 0.3 & & DCD\_LR–U19 & 8.04 & 0.27 & & & 0.59 & 0.569 \\ s & DCD\_RL–all & 9.59 & 1.25 & - & DCD\_LL–all & 9.54 & 1.16 & + & 0.65 & 0.21 & 0.84 \\ s & DCD\_RL–U12 & 11.18 & 0.93 & & DCD\_LL–LU12 & 11.15 & 0.75 & & & 0.97 & 0.334 \\ s & DCD\_RL–U13 & 10.54 & 0.93 & & DCD\_LL–U13 & 10.39 & 0.74 & & & 0.24 & 0.812 \\ s & DCD\_RL–U14 & 10 & 1.09 & & DCD\_LL–U14 & 9.65 & 0.83 & & & 0.93 & 0.366 \\ s & DCD\_RL–U15 & 9.52 & 0.93 & & DCD\_LL–U15 & 9.53 & 0.91 & & & 2.32 & **0.036** \\ s & DCD\_RL–U16 & 8.65 & 0.43 & & DCD\_LL–U16 & 8.9 & 0.58 & & & \(-0.14\) & **0.888** \\ s & DCD\_RL–U17 & 8.67 & 0.51 & & DCD\_LL–U17 & 8.8 & 0.51 & & & \(-3.35\) & **0.004** \\ s & DCD\_RL–U18 & 8.73 & 0.53 & & DCD\_LL–U18 & 8.54 & 0.66 & & & \(-1.63\) & 0.128 \\ \hline \end{tabular} Note: N—number of participants, XA (%)—average as a percentage, SD—standard deviation, SE—standard error, all—whole sample, U12—group under 12 years of age,... U19—group under 19 years of age, DLU—use of dominant leg, (%)—unit.  
\end{table} 
Table 2: Descriptive statistics and \(t\)-tests. Statistically significant differences are marked in bold. Table 3 shows the statistics of the variables considered in relation to the relationship between the proportion of dominant leg use in the game and functional asymmetries. The proportion of dominant leg use in the game is statistically significantly related to the differences between the legs in ball flight speed when kicking from a standing position in entire sample and in the U17 and in ball flight speed when kicking with a run-up only in the whole sample. The proportion of use of the dominant leg in the game is statistically significantly correlated with the differences between the legs in the relative maximum strength in the CMJ in the U15. There are no statistically significant correlations with the differences between the right and left leg when dribbling the ball with changing diagonals on the right and left obstacle course in the entire sample and in any age group.