## 4 Discussion
\begin{tabular}{c c c c c c} \hline \hline
**Stabilometric Outcomes** & \multicolumn{2}{c}{**Open Eyes**} & \multicolumn{2}{c}{**Closed Eyes**} \\  & **Pos. A** & **Pos. B** & **Pos. C** & **Pos. A** & **Pos. B** & **Pos. C** \\ \hline Oscillation & \(31.7\pm 20.5\) & \(24.6\pm 15.0\) & \(26.9\pm 20.6\) & \(1.4\pm 42.9\) & \(68.1\pm 25.7\)\({}^{*}\) & \(8.5\pm 36.8\) \\ Surface (mm\({}^{2}\)) & \((-9.1\); \(72.7\)) & \((-5.3\); \(54.7\)) & \((-14.3\pm 68.1)\) & \((-84.2\pm 87.2)\) & \((16.6\); \(119.5)\) & \((-64.9)\) \\ Total Oscillation & \(11.7\pm 34.4\) & \(29.1\pm 36.0\) & \(1.5\pm 30.6\) & \(18.9\pm 36.9\) & \(19.9\pm 28.1\) & \(14.5\pm 36.5\) \\  & \((-57.0\); \(80.53)\) & \((-42.7\); \(101.0)\) & \((-59.6\); \(62.7)\) & \((-54.8\pm 92.6)\) & \((-36.2\); \(76.1)\) & \((-58.2\); \(87.4)\) \\ ML-Length & \(0.7\pm 0.9\) & \(0.5\pm 1.0\) & \(0.8\pm 0.9\) & \(0.8\pm 0.8\) & \(0.5\pm 0.9\) & \(5.6\pm 39.7\) \\  & \((-1.0\); \(2.5\)) & \((-1.4\); \(2.5\)) & \((-1.0\); \(2.7\)) & \((-0.9\); \(2.5\)) & \((-1.2\); \(2.4)\) & \((-73.7\); \(85.0)\) \\ AP-Length & \(4.2\pm 2.9\) & \(3.6\pm 3.3\) & \(5.8\pm 3.2\) & \(1.9\pm 3.2\) & \(3.3\pm 3.0\) & \(2.0\pm 30.2\) \\  & \((-1.6\); \(10.1)\) & \((-3.1\); \(10.4)\) & \((-0.7\); \(12.4)\) & \((-4.4\); \(8.4\)) & \((-2.6\); \(9.4)\) & \((-58.2\); \(62.3)\) \\ LFS & \(0\pm 0.0\) & \(0.0\pm 0.0\) & \(0.0\pm 0.0\) & \(0.0\pm 0.0\) & \(0.0\pm 0.0\) & \(5.3\pm 51.5\) \\  & \((-0.1\); \(0.1)\) & \((0.0\pm 0.2)\) & \((-0.1\); \(0.1)\) & \((-0.1\); \(0.0)\) & \((0.0\pm 0.0)\) & \((-97.4\); \(108.1)\) \\ SVFAP & \(3.8\pm 2.6\) & \(2.8\pm 2.7\) & \(4.2\pm 2.7\) & \(1.0\pm 2.8\) & \(3.6\pm 2.6\) & \(10.0\pm 31.0\) \\  & \((-1.4\); \(9.2)\) & \((-2.5\); \(8.2\)) & \((-1.1\); \(9.6)\) & \((-4.5\); \(6.7)\) & \((-1.6\); \(9.0)\) & \((-51.9\); \(72.0)\) \\ ASV (mm/s) & \(5.0\pm 3.3\) & \(3.9\pm 3.5\) & \(5.8\pm 3.5\) & \(1.5\pm 3.4\) & \(4.5\pm 3.3\) & \(1.9\pm 40.9\) \\  & \((-1.7\); \(11.8)\) & \((-3.0\); \(10.9)\) & \((-1.1\); \(12.8)\) & \((-5.3)\) & \((-2.8\); \(11.1)\) & \((-79.7\); \(83.5)\) \\ Mean speed & \(0.3\pm 1.0\) & \(0.9\pm 1.1\) & \(0.0\pm 0.9\) & \(0.5\pm 1.1\) & \(0.6\pm 0.8\) & \(16.4\pm 45.6\) \\ (mm/s) & \((-1.8\); \(2.5\)) & \((-1.3\); \(3.1)\) & \((-1.8\); \(1.9)\) & \((-1.7\); \(2.9)\) & \((-1.1\); \(2.4)\) & \((-74.6\); \(107.5)\) \\ \hline \hline \end{tabular}  Between-Group Differences: Mean \(\pm\) SD (95% CI); LPS: Length as a function of the surface; SVFAP: Speed variation asThe TMD sample analyzed in this study showed several sociodemographic characteristics differences with the healthy sample. We found that healthy controls were heavier and showed greater BMI compared with TMD subjects. These results are consistent with the current literature since patients with TMD are more likely to present decreased BMI and abdominal obesity compared with healthy controls [25]. However, it should be considered that other studies found no association between weight nor BMI with TMD [4; 26; 27]. In addition, foot size differences were found between healthy and TMD populations. Although foot size was included in the multivariable analysis, it should be considered that foot size is negatively correlated with total oscillation length, LFS, and mean speed and positively correlated with ASV and SVFAP and, therefore, affects the differences observed. Regarding the clinical relevance of balance differences between patients with TMD and healthy subjects, evidence is controversial. Since trigeminal proprioceptive inferences to the vestibular systems are reported, it is suggested that stabilometry could be used for finding relevant balance differences during the clinical practice or research [3]. Although there is evidence supporting balance difference between myogenous TMD and healthy populations (in particular, sway area and mean speed) [28], several evidence did not show a clear association between TMD and postural instability [29; 30]. In fact, a previous study found greater sway index, ML-Length, and medial-lateral symmetry scores in healthy populations [31].