## 3 Results
### Inter-Group (Healthy vs. PD Groups) Postural Differences in Upright Standing
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline  & \multicolumn{3}{c}{**T0**} & \multicolumn{3}{c}{**T1**} & \multicolumn{3}{c}{**Multiple Comparisons Across**} \\ \cline{2-10}  & \multicolumn{2}{c}{**Without K1**} & \multicolumn{2}{c}{**with K1**} & \multicolumn{2}{c}{**Without K1**} & \multicolumn{2}{c}{**with K1**} & \multicolumn{2}{c}{**with K1**} & \multicolumn{2}{c}{**(Post Hodo)**} \\ \cline{2-10}
**Sagittal** & \multicolumn{2}{c}{**A**} & \multicolumn{2}{c}{**B**} & \multicolumn{2}{c}{**C**} & \multicolumn{2}{c}{**D**} & \multicolumn{2}{c}{**A vs.**} & \multicolumn{2}{c}{**A vs.**} & \multicolumn{2}{c}{**B vs.**} & \multicolumn{2}{c}{**B vs.**} & \multicolumn{2}{c}{**C vs.**} \\ \cline{2-10}
**Parameters** & \multicolumn{3}{c}{**Mean \(\pm\) SD (\({}^{***,\,\text{max}}\)) or Median (Percentiles 25\%, 75\%)**} & \multicolumn{3}{c}{**D**} & \multicolumn{3}{c}{**C**} & \multicolumn{3}{c}{**D**} & \multicolumn{3}{c}{**C**} & \multicolumn{3}{c}{**D**} & \multicolumn{3}{c}{**C**} \\ \hline CT [Deg] & 61.1 \(\pm\) 17.59 (\({}^{072,88,86}\)) & 61.0 \(\pm\) 19.370(\({}^{072,86,77}\)) & 51.8 \(\pm\) 9.07(\({}^{041,168,68}\)) & 53.5 \(\pm\) 10.60(\({}^{038,71,2}\)) & 0.994 & 0.451 & 0.562 & 0.461 & 0.572 & 0.439 \\ \hline DA [Deg] & 146 (143; 150) & 149 (144; 152) & 145 (143; 150) & 150 (144; 152) & 0.127 & 0.288 & 0.770 & 0.060 & 0.212 & 0.180 \\ \hline LA [Deg] & 194 (191; 197) & 190 (185; 195) & 195 (191; 201) & 195 (191; 199) & 0.720 & 0.858 & 0.374 & 0.592 & 0.592 & 0.288 \\ \hline TT [Deg] & 24.4 \(\pm\) 6.39(\({}^{0412,37,40}\)) & 21.8 \(\pm\) 6.02(\({}^{0212,328,28}\)) & 28.8 \(\pm\)7.26(\({}^{0411,395}\)) & 25.9 \(\pm\) 7.12(\({}^{031,37,5}\)) & 0.342 & 0.558 & 0.955 & 0.247 & 0.505 & 0.116 \\ \hline STA [Deg] & \(-\)8.75 (\(-\)10.8; \(-\)5.4) & \(-\)8.10 (\(-\)10.0; \(-\)3.7) & \(-\)8.15 (\(-\)9.0; \(-\)4.2) & \(-\)7.10 (\(-\)9.3; \(-\)1.3) & 0.338 & 0.484 & 0.661 & 0.792 & 0.599 & 0.792 \\ \hline SCA [Deg] & 5.1 \(\pm\) 2.51(\({}^{0.51,6.5}\)) & 6.2 \(\pm\) 3.39(\({}^{0.21,11}\)) & 5.8 \(\pm\) 2.5 (\({}^{0.52,2}\)) & 5.7 \(\pm\) 2.5 (\({}^{0.53,6.0}\)) & 0.692 & 0.983 & 0.983 & 0.510 & 0.542 & 1.000 \\ \hline SCO [Deg] & 170 (149; 171) & 170 (154; 175) & 175 (169; 177) & 175 (172; 177) & 0.169 & 0.098 & **0.045 \({}^{*}\)** & 0.763 & 0.484 & 0.688 \\ \hline HSO [Deg] & 171 \(\pm\) 5.9 (\({}^{0.198,180}\)) & 171 \(\pm\) 7.2 (\({}^{0.51,82}\)) & 174 \(\pm\) 3.5 (\({}^{0.081,279}\)) & 174 \(\pm\) 3.1 (\({}^{0.081,279}\)) & 1.000 & 0.080 & 0.152 & 0.280 & 0.352 & 1.000 \\ \hline HSN [Deg] & 157 \(\pm\) 3.5 (\({}^{0.182,169}\)) & 157 \(\pm\) 3.9 (\({}^{0.180,186}\)) & 157 \(\pm\) 3.7 (\({}^{0.52,146}\)) & 158 \(\pm\) 3.4 (\({}^{0.51,246}\)) & 1.000 & 0.286 & 0.309 & 0.405 & 0.502 & 1.000 \\ \hline HSC [Deg] & 175 (174; 176) & 174 (172; 177) & 174 (172; 177) & 174 (173; 177) & 0.526 & 0.322 & 1.000 & 0.111 & 0.526 & 0.322 \\ \hline HST [Deg] & 190(185; 190) & 188(181; 190) & 188 (185; 190) & 188 (181; 189) & 0.293 & 0.537 & 0.256 & 0.658 & 0.929 & 0.596 \\ \hline SVA [mm] & 41.6 \(\pm\) 20.9 (\({}^{0.18,7.0}\)) & 47.4 \(\pm\) 23.5 (\({}^{0.63,0.27}\)) & 46.2 \(\pm\) 19.5 (\({}^{0.45,7.1}\)) & 45.8 \(\pm\) 19.0 (\({}^{0.13,6.42}\)) & 0.825 & 0.987 & 0.995 & 0.782 & 0.689 & 0.999 \\ \hline \end{tabular}
\end{table} 
Table 3: _Cont._in T1 without (\(p\) = 0.030) and with K1 (\(p\) = 0.002) conditions compared to T0 without K1 (Figure 6b), and of HSN average in T0 with K1 (\(p\) = 0.013) and T1 without (\(p\) = 0.004) and with K1 (\(p\) = 0.013) compared to T0 without K1 (Figure 6c). Moreover, as far as the excursion range is concerned, statistical analysis (Table 4) underlined a significant decrease in CNA range in T1 without K1 condition compared to T0 without (\(p\) = 0.002) and with K1 (\(p\) = 0.001), and in T1 with K1 compared to T0 without K1 (\(p\) = 0.008) and with K1 (\(p\) = 0.006); DA range in T1 without K1 compared to T0 without (\(p\) = 0.037) and with K1 (\(p\) = 0.030), and in T1 with K1 compared to T0 without K1 (\(p\) = 0.011) and with K1 (\(p\) = 0.009).