Table 5.

QS factor model: factor loadings of the sensor-based measures, corresponding domains and Cumulative Variance (CV) (Varimax Rotation).

Domain	Postural Instability	AP Postural Reaction Time and Jerkiness	ML Postural Reaction Time and Jerkiness	AP Postural Control Impairment
Factor	QS1	QS2	QS3	QS4
Range A ML	0.948	−0.107	−0.145	0.066
RMS A ML	0.933	−0.012	−0.250	0.015
SA DISPL	0.928	0.011	−0.069	0.129
SP ML DISPL	0.872	−0.142	−0.096	0.183
MV ML DISPL	0.795	−0.119	−0.105	0.203
EA DISPL	0.774	0.056	−0.115	−0.029
SP Planar DISPL	0.764	−0.056	−0.082	0.625
Range A AP	0.706	0.185	−0.107	0.432
RMS A AP	0.675	0.288	−0.144	0.296
CF AP	−0.126	−0.983	0.113	−0.003
F95 AP	−0.103	−0.918	0.141	−0.068
NJS AP	0.121	−0.789	0.106	−0.130
F50 AP	−0.129	−0.774	0.102	0.165
CF ML	−0.195	−0.201	0.957	−0.024
F95% ML	−0.263	−0.153	0.872	−0.048
NJS ML	−0.051	−0.168	0.849	−0.109
F50% ML	−0.088	−0.207	0.794	−0.010
MV AP DISPL	0.533	−0.006	−0.097	0.802
SP AP DISPL	0.626	−0.004	−0.084	0.765
SE ML	−0.169	0.03	0.230	−0.041
SE AP	0.117	−0.312	0.094	−0.073
FD ML	−0.066	0.178	−0.156	−0.112
FD AP	0.016	−0.280	0.032	−0.298
CV%	31	46	61	70
Relevant factor loadings (absolute value > 0.5) are bolded

ACRONYMS: A: Accelerometer; AP: Antero-Posterior; CF: Centroidal Frequency; CV: Cumulative Variance; EA: Ellipse Area; F_50%: Median Frequency; F_95%: Frequency below 95% of total signal power; FD: Frequency Dispersion; Medio-Lateral; MV: Mean Velocity; NJS: Normalized Jerk Score; RMS: Root Mean Square; SA: Sway Area; SE: Spectral Entropy; SP: Sway Path; V: Vertical.