Table 1.

Mean and standard deviation (SD) of stride time series means, coefficients of variation and α-DFA for each 3-min trials, and corresponding intraclass correlation coefficients (95 % confidence interval, CI). Means and standard deviations for the 15-min trial are also provided.

		Trial 1 Mean (SD)	Trial 2 Mean (SD)	Trial 3 Mean (SD)	Trial 4 Mean (SD)	Trial 5 Mean (SD)	ICC (95% CI)	15 min trial Mean (SD)
HY	Mean (s)	1.07 (0.07)	1.06 (0.07)	1.07 (0.07)	1.07 (0.07)	1.06 (0.07)	0.98 (0.95-0.99)	1.07 (0.07)
	CV (%)	1.69 (0.41)	1.53 (0.31)	1.71 (0.56)	1.77 (0.73)	1.73 (0.59)	0.55 (0.31-0.78)	1.76 (0.46)
	α-DFA	0.86 (0.21)	0.84 (0.20)	0.91 (0.14)	0.83 (0.19)	0.95 (016)	0.19 (0.01-0.50)	0.89 (0.09)
HE	Mean (s)	0.98 (0.07)	0.98 (0.07)	0.98 (0.07)	0.98 (0.07)	0.98 (0.07)	0.97 (0.96-0.99)	0.99 (0.06)
	CV (%)	1.62 (0.38)	1.50 (0.35)	1.53 (0.36)	1.54 (0.45)	1.67 (0.50)	0.50 (0.27-0.76)	1.71 (0.49)
	α-DFA	0.85 (0.24)	0.78 (0.21)	0.79 (0.14)	0.75 (0.20)	0.82 (0.20)	0.46 (0.23-0.73)	0.87 (0.16)
PD	Mean (s)	1.01 (0.08)	1.01 (0.08)	1.01 (0.09)	1.02 (0.08)	1.02 (0.09)	0.95 (0.89-0.98)	1.02 (0.08)
	CV (%)	2.07 (0.47)	1.96 (0.40)	1.90 (0.50)	1.93 (0.54)	2.21 (0.77)	0.72 (0.50-0.89)	2.20 (0.85)
	α-DFA	0.84 (0.18)	0.80 (0.19)	0.82 (0.17)	0.74 (0.18)	0.78 (0.17)	0.18 (−0.02-0.52)	0.77 (0.12)

HY Healthy young, HE Healthy elderly, PD Parkinson’s disease, CV Coefficient of variation, DFA Detrended fluctuation analysis, ICC Intraclass correlation.