Table 4.

Correlations of cognitive/UHDRS‐TMS and iSway parameters

	MoCA	SDMT	Stroop	Digit span	CERAD‐recall	Animal naming	JLO	UHDRS‐TMS
Condition 1: Feet apart, eyes open, firm surface
95% Ellipse sway area (m2/s4)	‐0.258	‐0.382	‐0.366	‐0.073	‐0.018	‐0.31	‐0.32	0.528 *
Total jerk (m2/s5)	‐0.174	‐0.132	‐0.293	0.105	0.089	‐0.15	‐0.328	0.251
RMS sway (m/s2)	‐0.248	‐0.208	‐0.464	0.032	‐0.001	‐0.275	‐0.298	0.321
Feet apart, eyes closed, firm surface
95% Ellipse sway area (m2/s4)	‐0.136	‐0.064	‐0.135	0.099	0.089	‐0.08	‐0.343	0.189
Total jerk (m2/s5)	‐0.14	0.128	‐0.133	0.262	0.166	‐0.086	‐0.497 *	0.049
RMS sway (m/s2)	‐0.113	0.044	‐0.281	0.162	0.089	‐0.086	‐0.344	0.027
Feet together, eyes open, firm surface
95% Ellipse sway area (m2/s4)	‐0.262	‐0.439	‐0.349	‐0.266	‐0.075	‐0.364	‐0.134	0.679 **
Total jerk (m2/s5)	‐0.224	‐0.196	‐0.037	‐0.006	0.063	‐0.22	‐0.209	0.478
RMS sway (m/s2)	‐0.248	‐0.392	‐0.319	‐0.326	‐0.131	‐0.456	‐0.094	0.557*
Feet together, eyes closed, firm surface
95% Ellipse sway area (m2/s4)	‐0.41	‐0.574 *	‐0.343	‐0.309	‐0.142	‐0.448	‐.033	0.644 **
Total jerk (m2/s5)	‐0.348	‐0.468	‐0.133	‐0.187	0.033	‐0.255	‐0.43	0.525 *
RMS sway (m/s2)	‐0.340	‐0.554 *	‐0.355	‐0.318	‐0.122	‐0.43	‐0.308	0.662 **
Feet apart, eyes open, foam surface
95% Ellipse sway area (m2/s4)	0.032	‐0.314	‐0.419	‐0.046	0.121	‐0.084	‐0.216	0.479
Total jerk (m2/s5)	0.113	0.039	‐0.174	0.306	0.280	0.073	‐0.264	0.062
RMS sway (m/s2)	0.11	‐0.203	‐0.468	0.025	0.219	‐0.066	‐0.245	0.36
Feet apart, eyes closed, foam surface
95% Ellipse sway area (m2/s4)	‐0.230	‐0.059	‐0.038	‐0.069	‐0.058	0.081	‐0.06	0.264
Total jerk (m2/s5)	‐0.108	0.181	‐0.034	0.248	0.023	0.213	0.009	‐0.134
RMS sway (m/s2)	‐0.183	‐0.042	‐0.116	‐0.108	0.001	0.07	‐0.134	0.214
Feet apart, eyes open, dual‐task “C”
95% Ellipse sway area (m2/s4)	‐0.176	‐0.262	‐0.302	‐0.058	0.065	‐0.304	‐0.617 **	0.296
Total jerk (m2/s5)	‐0.14	‐0.066	‐0.155	0.062	0.089	‐0.23	‐0.549 *	0.133
RMS sway (m/s2)	‐0.126	‐0.228	‐0.387	‐0.064	0.102	‐0.269	‐0.581 *	0.23
Feet apart, eyes closed, dual‐task “L”
95% Ellipse sway area (m2/s4)	‐0.143	‐0.150	‐0.234	0.111	0.152	‐0.166	‐0.569 *	0.186
Total jerk (m2/s5)	‐0.216	‐0.064	‐0.138	0.159	0.131	‐0.118	‐0.624 **	0.035
RMS sway (m/s2)	‐0.049	‐0.076	‐0.205	0.178	0.253	‐0.015	‐0.544 *	0.102
Feet together, eyes open, dual‐task “A”
95% Ellipse sway area (m2/s4)	‐0.142	‐0.164	‐0.059	‐0.028	0.157	‐0.122	‐0.527 *	0.292
Total jerk (m2/s5)	‐0.044	‐0.047	‐0.202	0.188	0.253	‐0.15	‐0.507 *	0.075
RMS sway (m/s2)	‐0.132	‐0.137	‐0.038	‐0.042	0.116	‐0.139	‐0.528 *	0.165
Feet together, eyes closed, dual‐task “S”
95% Ellipse sway area (m2/s4)	‐0.245	‐0.267	‐0.127	‐0.112	‐0.084	‐0.175	‐0.557 *	0.395
Total jerk (m2/s5)	‐0.248	‐0.216	‐0.149	0.037	0.615	‐0.114	‐0.634 **	0.254
RMS sway (m/s2)	‐0.163	‐0.275	‐0.140	‐0.109	‐0.045	‐0.196	‐0.551 *	0.399

Abbreviations: CERAD, Consortium to Establish a Registry for Alzheimer's disease; CW, Stroop, Color‐Word; JLO, Judgment of Line Orientation; MoCA, Montreal Cognitive Assessment; SDMT, Symbol Digit Modalities Test; TMS, Total Motor Score; UHDRS, Unified Huntington's disease Rating Scale.

Digit span values were correlated with HD patients’ iSWAY performance under varying sensory conditions. Significant differences are bolded. All values are Spearman's rho (r).

^* P < 0.05;

^** P < 0.01;

^*** P < 0.001;

^*** P < 0.0001.