## 3 Results
### Analysis of Electromyographic Data
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Index** & **Normal Range** & \
\begin{tabular}{c} **JIA Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} &
\begin{tabular}{c} **Control Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} & \(p\)-Value** \\ \hline POC TA & 83\% \(\leq\) X \(\leq\) 100\% & 82.04 \(\pm\) 7.800 & 84.11 \(\pm\) 6.126 & 0.4256 b \\ POC MM & 83\% \(\leq\) X \(\leq\) 100\% & 80.10 \(\pm\) 15.65 & 80.44 \(\pm\) 14.78 & 0.8702 a \\ POC SCM & 83\% \(\leq\) X \(\leq\) 100\% & 81.92 \(\pm\) 5.661 & 79.34 \(\pm\) 9.398 & 0.3703 b \\ BAR & 90\% \(\leq\) X \(\leq\) 100\% & 85.63 \(\pm\) 6.671 & 85.76 \(\pm\) 7.078 & 0.9263 a \\ TORS & 90\% \(\leq\) X \(\leq\) 100\% & 88.65 \(\pm\) 3.468 & 88.73 \(\pm\) 4.363 & 0.9528 b \\ IMP & 85\% \(\leq\) X \(\leq\) 115\% & 155.1 \(\pm\) 77.00 & 119.8 \(\pm\) 99.92 & 0.0264 a,* \\ ASIM & \(-\)10\% \(\leq\) X \(\leq\) +10\% & 2.347 \(\pm\) 17.70 & 0.4833 \(\pm\) 15.42 & 0.4363 a \\ \hline \end{tabular} Legend: POC TA: percentage overlapping coefficient of anterior temporalis muscles; POC MM: percentage overlapping coefficient of masset muscles; POC SCM: percentage overlapping coefficient of stemodelotransoid muscles; BAR: percentage overlapping coefficient of contact between posterior and anterior teeth; TORS: torsion index; IMP: impact index; ASIM: asymmetry index; SD: standard deviation; a: Mann–Whitney U test; b: \(t\)-test; *: \(p<0.05\).  
\end{table} 
Table 6: sEMG parameters in JIA and control groups at baseline. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Index** & **Normal Range** & \
\begin{tabular}{c} **JIA Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} &
\begin{tabular}{c} **Control Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} & \(p\)-Value** \\ \hline POC TA & 83\% \(\leq\) X \(\leq\) 100\% & 78.69 \(\pm\) 11.31 & 81.59 \(\pm\) 8.652 & 0.6827 a \\ POC MM & 83\% \(\leq\) X \(\leq\) 100\% & 75.63 \(\pm\) 16.40 & 77.62 \(\pm\) 18.06 & 0.5949 a \\ POC SCM & 83\% \(\leq\) X \(\leq\) 100\% & 83.88 \(\pm\) 4.372 & 81.36 \(\pm\) 9.920 & 0.9349 a \\ BAR & 90\% \(\leq\) X \(\leq\) 100\% & 77.74 \(\pm\) 19.15 & 84.10 \(\pm\) 5.394 & 0.574 a \\ TORS & 90\% \(\leq\) X \(\leq\) 100\% & 83.19 \(\pm\) 12.74 & 89.16 \(\pm\) 3.163 & 0.0814 a \\ IMP & 85\% \(\leq\) X \(\leq\) 115\% & 91.06 \(\pm\) 51.73 & 77.07 \(\pm\) 29.88 & 0.3724 b \\ ASIM & \(-\)10\% \(\leq\) X \(\leq\) +10\% & 8.100 \(\pm\) 21.55 & 5.073 \(\pm\) 19.17 & 0.6875 b \\ \hline \end{tabular} Legend: POC TA: percentage overlapping coefficient of anterior temporalis muscles; POC MM: percentage overlapping coefficient of masset muscles; POC SCM: percentage overlapping coefficient of stemodelotransoid muscles; BAR: percentage overlapping coefficient of contact between posterior and anterior teeth; TORS: torsion index; IMP: impact index; ASIM: asymmetry index; SD: standard deviation; a: Mann–Whitney U test; b: \(t\)-test; *: \(p<0.05\).  
\end{table} 
Table 7: sEMG parameters in JIA patients and healthy subjects at second examination. \begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Index** & **Normal Range** & \
\begin{tabular}{c} **JIA Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} &
\begin{tabular}{c} **Control Group** \\ **(Mean \(\pm\) SD)** \\ \end{tabular} & \(p\)-Value** \\ \hline POC TA & 83\% \(\leq\) X \(\leq\) 100\% & 82.04 \(\pm\) 7.800 & 78.69 \(\pm\) 11.31 & 0.713 a \\ POC MM & 83\% \(\leq\) X \(\leq\) 100\% & 80.10 \(\pm\) 15.65 & 75.63 \(\pm\) 16.40 & 0.3046 a \\ POC SCM & 83\% \(\leq\) X \(\leq\) 100\% & 81.92 \(\pm\) 5.661 & 83.88 \(\pm\) 4.372 & 0.2975 b \\ BAR & 90\% \(\leq\) X \(\leq\) 100\% & 85.63 \(\pm\) 6.671 & 77.74 \(\pm\) 19.15 & 0.3096 a \\ TORS & 90\% \(\leq\) X \(\leq\) 100\% & 88.65 \(\pm\) 3.468 & 83.19 \(\pm\) 12.74 & 0.237 a \\ IMP & 85\% \(\leq\) X \(\leq\) 115\% & 155.1 \(\pm\) 77.00 & 91.06 \(\pm\) 51.73 & 0.0124 b,* \\ ASIM & \(-\)10\% \(\leq\) X \(\leq\) +10\% & 8.100 \(\pm\) 21.55 & 2.347 \(\pm\) 17.70 & 0.3892 a \\ \hline \end{tabular} Legend: see legend at Table 6.  
\end{table}