## 3 Results  
The study population consisted of 89 people. Table 1 presents the general measurement values for motor segments L4/5 and L5/S1. This table includes data on the maximum horizontal value (MaxX), maximum vertical value (MaxY), minimum horizontal value (MinX), perimeter, and area. The left- and right-side results are shown for each segment. I-III indicate the numbers of the cross-sections used for the tests. In the L4/5 motion segment, the maximum value for MaxX was found in section III and was 11.7 mm for the right side and 11.1 mm for the left side. Similar patterns were found in the L5/S1 motion segment. MaxX had the highest value in section III and it was 12.2 mm (right side) and 10.8 mm (left side). The minimum value in the L4/5 movement segment is 10.3 mm, which was found in the second section (left side). For the L5/S1 segment, the minimum value was observed in the first section (left side) and this was 10.1 mm. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline  & & \multicolumn{2}{c}{**L4/5**} & \multicolumn{4}{c}{**L5/S1**} \\ \hline  & & **R** & **L** & \(\mathbf{p}\) & **R** & **L** & \(\mathbf{p}\) \\ \hline MaxX & I & 10.2 \(\pm\) 2.3 & 10.5 \(\pm\) 2.5 & NS & 10.7 \(\pm\) 3.5 & 10.1 \(\pm\) 2.1 & NS \\  & II & 10.4 \(\pm\) 2.1 & 10.3 \(\pm\) 2 & NS & 11.2 \(\pm\) 2.4 & 10.4 \(\pm\) 2.5 & NS \\  & III & 11.7 \(\pm\) 2.8 & 11.1 \(\pm\) 2.5 & NS & 12.2 \(\pm\) 2.5 & 10.8 \(\pm\) 3.3 & NS \\  & \(p\) & NS & NS & & NS & NS & \\ \hline MaxY & I & 18.8 \(\pm\) 3.6 & 19.3 \(\pm\) 4 & NS & 17.2 \(\pm\) 4.3 & 17.1 \(\pm\) 4.4 & NS \\  & II & 17.6 \(\pm\) 3.2 & 17.8 \(\pm\) 3.4 & NS & 15.7 \(\pm\) 3.8 & 16 \(\pm\) 4 & NS \\  & III & 17.5 \(\pm\) 3.7 & 17.3 \(\pm\) 3.1 & NS & 15.1 \(\pm\) 3.4 & 15 \(\pm\) 4.3 & NS \\  & \(p\) & NS & NS & & NS & NS & \\ \hline MinX & I & 5.6 \(\pm\) 2.9 & 5.7 \(\pm\) 2.3 & NS & 6.2 \(\pm\) 3.3 & 5.3 \(\pm\) 2.4 & NS \\  & II & 5.4 \(\pm\) 2.3 & 5.2 \(\pm\) 2.2 & NS & 6.7 \(\pm\) 7.5 & 5.4 \(\pm\) 2.3 & NS \\  & III & 5.6 \(\pm\) 2.4 & 5.8 \(\pm\) 2.3 & NS & 6.2 \(\pm\) 2.6 & 6.3 \(\pm\) 2.6 & NS \\  & \(p\) & NS & NS & & NS & NS & \\ \hline Circumference & I & 53.5 \(\pm\) 8.9 & 54.8 \(\pm\) 9.2 & NS & 51 \(\pm\) 11.6 & 49.3 \(\pm\) 9.2 & NS \\  & II & 51 \(\pm\) 8.1 & 51.1 \(\pm\) 8 & NS & 49.1 \(\pm\) 11.8 & 47.3 \(\pm\) 9.9 & NS \\  & III & 52.5 \(\pm\) 8.7 & 51.9 \(\pm\) 7.7 & NS & 48.9 \(\pm\) 8.6 & 47.5 \(\pm\) 10.1 & NS \\  & \(p\) & NS & NS & & NS & NS & \\ \hline Area & I & 174.3 \(\pm\) 52.2 & 173.9 \(\pm\) 47.6 & NS & 152.2 \(\pm\) 48.6 & 142.6 \(\pm\) 44.1 & \\  & II & 158.7 \(\pm\) 46.5 & 156.4 \(\pm\) 48.7 & NS & 157 \(\pm\) 73 & 140.3 \(\pm\) 44 & NS \\  & III & 167.4 \(\pm\) 53.1 & 166.8 \(\pm\) 55.7 & NS & 158.9 \(\pm\) 53.6 & 152.6 \(\pm\) 65.2 & NS \\  & \(p\) & NS & NS & & NS & NS & NS \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Measurement results (mean \(\pm\) SD in mm and area section in mm\({}^{2}\)) for motion segment L4/5 and L5/S1 (\(N=89\)). MaxX—Maximal Horizontal Dimension, MaxY—Maximal Vertical Dimension, MinX—Minimal Horizontal Dimension, NS—not statistically significant. For Max Y, the maximum value was observed in I sections. For the L4/5 motion segment, it was 18.8 mm (right) and 19.3 mm (left sides), while in the L5/S1 motion segment, the maximum was 17.2 mm (right side) and 17.1 mm (left side). The smallest dimension was found in section III (left side). Its value was 17.3 mm. On the other hand, for the L5/S1 motion segment, the minimum value of Max Y was 15 mm (left side). If the MinX parameter is taken into account, its highest L4/5 value was observed in the III section. This was 5.8 mm (right side). On the other hand, in the L5/S1 motion segment, it was 6.7 mm (right side, section II). The minimum MinX value for the L4/5 motion segment was 5.2 mm (left side, section II); in the L5/S1 motion segment, it was 5.3 mm. The maximum value for the L4/5 circumference was found in segment I and this was 54.8 mm (section I). The minimum was observed in the case of section II and this was 51 mm.