Table 5 Baseline beta band multivariate analyses according to ROI.

Variables	Beta-coefficient	95% CI	p-value	R²
Frontal region				0.240
WOMAC pain scale	0.013	0.003 to 0.024	0.010
Upper limb PPT	0.031	0.012 to 0.050	0.002
Kellgren–Lawrence scale	0.033	0.004 to 0.062	0.027
Bilateral affectation	0.024	− 0.026 to 0.074	0.343
HAD-depression scale	− 0.008	− 0.020 to 0.003	0.133
Central region				0.161
Kellgren–Lawrence scale	0.044	0.012 to 0.075	0.007
Timed up and go score	− 0.004	− 0.008 to − 0.0003	0.037
CSP average	− 0.001	− 0.002 to 0.00005	0.063
WOMAC stiffness scale	0.006	− 0.010 to 0.022	0.471
Parietal region				0.259
CSP average	− 0.001	− 0.002 to − 8.520	0.048
Kellgren–Lawrence scale	0.064	0.029 to 0.099	0.001
Berg balance scale	0.006	0.002 to 0.011	0.006
Bilateral affectation	0.027	− 0.025 to 0.080	0.299

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