## 3 Results
### Characteristics of the Study Group
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**Study Group**} & \multicolumn{2}{c}{**Young Group**} & \multicolumn{2}{c}{**Older Group**} & \multicolumn{2}{c}{**t-Test**} \\ \cline{3-10}  & & \multicolumn{2}{c}{**n = 70**} & \multicolumn{2}{c}{**n = 30**} & \multicolumn{2}{c}{**n = 40**} & \multicolumn{2}{c}{**t -Test**} \\ \cline{3-10}  & & **Mean [\%]** & \(\pm\)**SD** & **Mean [\%]** & \(\pm\)**SD** & **Mean [\%]** & \(\pm\)**SD** & **t** & \(p\)** \\ \hline \multirow{3}{*}{Head} & Forehead & 67.72 & 6.37 & 67.72 & 6.37 & 65.40 & 6.68 & 3.86 & 0.000 \\  & Gini index & 0.081 & & 0.101 & & 0.107 & & & \\ \hline \multirow{3}{*}{Neck} & Middle neck & 69.89 & 6.05 & 69.89 & 6.05 & 67.74 & 5.76 & 3.74 & 0.000 \\  & Gini index & 0.076 & & 0.105 & & 0.096 & & & \\ \hline \multirow{3}{*}{Trunk} & Trapezius & 69.36 & 6.35 & 69.36 & 6.35 & 67.33 & 6.71 & 3.32 & 0.001 \\  & Gini index & 0.078 & & 0.102 & & 0.104 & & & \\ \cline{2-10}  & C-Th & 63.39 & 7.73 & 63.39 & 7.73 & 60.89 & 7.63 & 3.36 & 0.001 \\  & Gini index & 0.097 & & 0.122 & & 0.119 & & & \\ \cline{2-10}  & Th-L & 65.74 & 7.76 & 65.74 & 7.76 & 62.79 & 7.20 & 4.06 & 0.000 \\  & Gini index & 0.097 & & 0.117 & & 0.110 & & & \\ \cline{2-10}  & L-S & 66.11 & 6.43 & 66.11 & 6.43 & 65.08 & 4.87 & 1.57 & 0.122 \\  & Gini index & 0.087 & & 0.131 & & 0.091 & & & \\ \hline \multirow{3}{*}{Upper limb} & Wrist extensors & 66.26 & 7.46 & 66.26 & 7.46 & 65.54 & 6.72 & 0.93 & 0.355 \\  & Gini index & 0.09 & & 0.135 & & 0.104 & & & \\ \cline{2-10}  & Cubital fossa & 66.32 & 6.28 & 66.32 & 6.28 & 65.74 & 6.46 & 0.90 & 0.373 \\  & Gini index & 0.082 & & 0.116 & & 0.105 & & & \\ \cline{2-10}  & Carpal tunnel & 56.47 & 9.69 & 56.47 & 9.69 & 59.00 & 8.37 & \(-\)2.63 & 0.011 \\  & & 0.125 & & 0.177 & & 0.128 & & & \\ \hline \multirow{3}{*}{Upper limb} & Femoral triangle & 64.16 & 9.74 & 64.16 & 9.74 & 60.80 & 8.84 & 3.61 & 0.001 \\  & Gini index & 0.114 & & 0.14 & & 0.130 & & & \\ \cline{2-10}  & Rectus femoris & 63.64 & 8.62 & 63.64 & 8.62 & 61.93 & 7.89 & 1.96 & 0.054 \\  & Gini index & 0.103 & & 0.139 & & 0.120 & & & \\ \hline \multirow{3}{*}{Tibialis anterior} & 69.94 & 69.93 & 69.94 & 6.93 & 70.00 & 5.26 & \(-\)0.09 & 0.929 \\  & Gini index & 0.081 & & 0.131 & & 0.091 & & & \\ \hline \multirow{3}{*}{Lower limb} & Ankle joint & 49.80 & 12.76 & 49.80 & 12.76 & 53.64 & 9.25 & \(-\)3.02 & 0.004 \\  & Gini index & 0.168 & & 0.244 & & 0.146 & & \\ \cline{2-10}  & Biceps femoris & 63.90 & 7.54 & 63.90 & 7.54 & 63.98 & 8.00 & \(-\)0.10 & 0.924 \\  & Gini index & 0.093 & & 0.128 & & 0.116 & & & \\ \hline \multirow{3}{*}{Popileal fossa} & 61.09 & 9.12 & 61.09 & 9.12 & 59.55 & 7.85 & 1.66 & 0.102 \\  & Gini index & 0.108 & & 0.152 & & 0.120 & & & \\ \hline \multirow{3}{*}{Gastrocnemius} & 64.80 & 8.60 & 64.80 & 8.60 & 64.95 & 7.80 & \(-\)0.17 & 0.868 \\  & Gini index & 0.102 & & 0.148 & & 0.117 & & & \\ \hline \multirow{3}{*}{Achilles tendon} & 40.34 & 17.65 & 40.34 & 17.65 & 48.54 & 13.33 & \(-\)5.29 & 0.000 \\  & Gini index & 0.275 & & 0.388 & & 0.201 & & & \\ \hline \multirow{3}{*}{Plantar fascia} & 59.71 & 11.90 & 67.72 & 6.37 & 61.99 & 12.15 & \(-\)1.81 & 0.075 \\ \cline{1-1}  & Gini index & 0.139 & & 0.173 & & 0.156 & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Mean values of rSO\({}_{2}\) obtained from the analyzed ROIs for the entire study group and the younger and older groups, including the analysis of intergroup differences. The results of the analysis of gender differences in rSO\({}_{2}\) values from the assessed ROIs are presented in Table 4. In the group of women, significantly lower rSO\({}_{2}\) values were found in the forehead (\(p\) = 0.035), middle neck (\(p\) = 0.01), wrist extensors (\(p\) = 0.04) and rectus femoris (\(p\) = 0.001) as well as a poplitcal fossa (\(p\) = 0.009) and higher rSO\({}_{2}\) values in the Achilles tendon (\(p\) = 0.002) have been obtained compared to men. However, due to the large differences in numbers between the groups of women and men, these results should be treated cautiously.