Supplemental Table 2. Correlations between Spastic Paraplegia Rating Scale (SPRS) and center of pressure variables in SPG4 subgroup.

Variables	 	VML
EO	VML EC	VML-Dif EO-EC	VAP
EO	VAP
EC	VAP-Dif EO-EC	AML
EO	AML
EC	AML-Dif EO-EC	AAP
EO	AAP
EC	AAP-Dif
EO-EC	
Age of onset 	Rho	-0.243	-0.075	-0.059	-0.301	-0.025	-0.017	-0.569	-0.100	0.142	-0.552	-0.017	0.008	
	p-value	0.529	0.847	0.881	0.431	0.949	0.966	0.110	0.797	0.715	0.123	0.966	0.983	
Duration of 	Rho	0.253	0.152	0.253	0.363	0.084	-0.093	0.422	0.295	0.068	0.498	0.008	-0.034	
disease	p-value	0.511	0.696	0.511	0.337	0.829	0.812	0.258	0.440	0.863	0.173	0.983	0.931	
SPRS	Rho	0.017	0.433	0.433	0.583	0.233	0.250	-0.183	0.633	0.467	0.700*	0.350	0.317	
	p-value	0.966	0.244	0.244	0.099	0.546	0.516	0.637	0.067	0.205	0.036	0.356	0.406	
mSPRS	Rho	-0.025	0.469	0.477	0.686*	0.218	0.176	-0.268	0.728*	0.611	0.753*	0.276	0.226	
 	p-value	0.949	0.203	0.194	0.041	0.574	0.651	0.486	0.026	0.081	0.019	0.472	0.559	

                  Note: * Correlation is significant at the 0.05 level (2 ends); ** The correlation is significant at the 0.01 level (2 ends); VML: Velocity mediolateral; VAP: 
                  Velocity anteroposterior; AML: Amplitude Mediolateral; AAP: Amplitude Anteroposterior; Dif: Difference from eyes open and eyes closed; EO: Eyes Open; 
                  EC: Eyes Closed