## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Group** & **Test** & **Mean** & **SD** & **\(t\)-Test (\(p\))** & **ICC** & **95\% CI** & **CV** & **SD** & **SEM** & **SEM\%** & **MDC \%** \\ \hline \multirow{2}{*}{G\({}_{9-10}\)} & Test & 47.47 & 8.80 & \multirow{2}{*}{0.465} & \multirow{2}{*}{0.894} & \multirow{2}{*}{(0.736-0.960)} & \multirow{2}{*}{0.037} & \multirow{2}{*}{0.053} & \multirow{2}{*}{2.65} & \multirow{2}{*}{5.54} & \multirow{2}{*}{7.35} & \multirow{2}{*}{15.37} \\  & Retest & 48.18 & 7.69 & & & & & & & & & \\ \hline \multirow{2}{*}{G\({}_{11-12}\)} & Test & 61.75 & 19.28 & \multirow{2}{*}{0.872} & \multirow{2}{*}{0.951} & \multirow{2}{*}{(0.865-0.982)} & \multirow{2}{*}{0.058} & \multirow{2}{*}{0.052} & \multirow{2}{*}{4.09} & \multirow{2}{*}{6.64} & \multirow{2}{*}{11.34} & \multirow{2}{*}{18.40} \\  & Retest & 61.50 & 18.28 & & & & & & & & & \\ \hline \multirow{2}{*}{G\({}_{13-14}\)} & Test & 84.13 & 10.82 & \multirow{2}{*}{0.044 *} & \multirow{2}{*}{0.876} & \multirow{2}{*}{(0.674-0.956)} & \multirow{2}{*}{0.028} & \multirow{2}{*}{0.038} & \multirow{2}{*}{3.85} & \multirow{2}{*}{4.52} & \multirow{2}{*}{10.66} & \multirow{2}{*}{12.52} \\  & Retest & 86.20 & 11.30 & & & & & & & & & \\ \hline \multirow{2}{*}{All Girls} & Test & 68.94 & 24.44 & \multirow{2}{*}{0.031 *} & \multirow{2}{*}{0.977} & \multirow{2}{*}{(0.947–0.990)} & \multirow{2}{*}{0.037} & \multirow{2}{*}{0.050} & \multirow{2}{*}{3.77} & \multirow{2}{*}{5.38} & \multirow{2}{*}{10.45} & \multirow{2}{*}{14.90} \\  & Retest & 71.34 & 25.28 & & & & & & & & & \\ \hline \multirow{2}{*}{All Boys} & Test & 68.00 & 21.02 & \multirow{2}{*}{0.326} & \multirow{2}{*}{0.958} & \multirow{2}{*}{(0.902–0.982)} & \multirow{2}{*}{0.052} & \multirow{2}{*}{0.057} & \multirow{2}{*}{4.48} & \multirow{2}{*}{6.52} & \multirow{2}{*}{12.41} & \multirow{2}{*}{18.07} \\  & Retest & 69.36 & 22.67 & & & & & & & & & \\ \hline \multirow{2}{*}{All Sample} & Test & 68.47 & 22.59 & \multirow{2}{*}{0.032 *} & \multirow{2}{*}{0.954} & \multirow{2}{*}{(0.920–0.974)} & \multirow{2}{*}{0.045} & \multirow{2}{*}{0.054} & \multirow{2}{*}{4.90} & \multirow{2}{*}{7.06} & \multirow{2}{*}{13.58} & \multirow{2}{*}{19.56} \\  & Retest & 70.35 & 23.08 & & & & & & & & & \\ \hline \hline \multicolumn{2}{c}{G\({}_{9-10}\) = age group 9–10 years; G\({}_{11-12}\) = age group 11–12 years; G\({}_{13-14}\) = age group 13–14 years; SD: standard deviation; \(t\)-test (\(p\)) = \(p\) value of paired \(t\)-test; ICC = intraclass correlation coefficient; 95% CI = confidence interval of ICC; CV: coefficient of variation; SEM = standard error of measurement (absolute values); SEM (\%) = SEM percentage values. MDC = minimal detectable change (absolute values); MDC% = MDC percentage values; * = significant difference between test 1 and test 2.} \\ \hline \end{tabular}
\end{table} 
Table 2: 1 RM values (kg) in LE test. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c} \hline \hline
**Group** & **Test** & **Mean** & **SD** & **\(t\)-Test (\(p\))** & **ICC** & **95\% CI** & **CV** & **SD** & **SEM** & **SEM\%** & **MDC** \%** \\ \hline \multirow{2}{*}{G\({}_{9-10}\)} & Test & 57.35 & 12.84 & \multirow{2}{*}{0.086} & \multirow{2}{*}{0.953} & \multirow{2}{*}{(0.868–0.983)} & \multirow{2}{*}{0.035} & \multirow{2}{*}{0.033} & \multirow{2}{*}{2.61} & \multirow{2}{*}{4.61} & \multirow{2}{*}{7.24} & \multirow{2}{*}{12.80} \\  & Retest & 55.76 & 11.53 & & & &The limits of agreement between the values of the entire sample, estimated from the two test sessions (test-retest) are graphically depicted in the Bland-Altman plot in Figure 4 (LE exercise) and Figure 5 (SBP). For muscle power data analysis, the percentage of 1 RM at which participants reached the highest value of muscle power was determined. This percentage was set at 70% of 1 RM in LE and at 50% of 1 RM in SBP.