Table 3.

Factor loadings, proportion of variance, and factor correlation matrix for the 10 gait parameters included in the factor analysis

	Factor 1	Factor 2	Factor 3	Factor 4
	(Regularity)	(Pace)	(Variability)	(Smoothness)
Walking speed	0.01	0.79	0.01	0.00
Mean stride time	0.00	0.80	−0.05	0.01
CV of stride time	0.12	−0.06	0.81	−0.06
CV of swing time	−0.09	0.02	0.65	0.11
AC-VT	0.77	0.20	0.05	− 0.07
AC-ML	0.83	−0.07	−0.13	0.17
AC-AP	0.83	−0.08	0.11	−0.07
HR-VT	0.01	0.05	0.18	0.51
HR-ML	0.09	−0.08	−0.14	0.69
HR-AP	−0.07	0.08	0.14	0.56
% of variance	30.1	11.3	9.9	5.9
Factor correlation matrix
Factor 2	0.29	1
Factor 3	0.53	0.22	1
Factor 4	0.23	0.21	0.33	1

The variables presented in boldface signify variables that loaded on each of the four factors above 0.5

CV: coefficient of variation, AC: autocorrelation coefficient, VT: vertical, ML: mediolateral, AP: anteroposterior, HR: harmonic ratio