Table 2.

Intraclass correlation coefficients (95 % confidence interval, CI) of stride time series means, coefficients of variation and α-DFA between the 15-min trial and each 3-min trials (Trial 1 to Trial 5), and between the 15-min trial and the first 150 stride intervals from the 15-min trial.

	ICC (95 % CI) between each shorter trials and the 15 min trial
		Trial 1	Trial 2	Trial 3	Trial 4	Trial 5	First 150 from 15-min
HY	Mean	0.35 (−0.22 – 0.73)	0.34 (−0.25 – 0.73)	0.34 (−0.25 – 0.73)	0.24 (−0.35 – 0.66)	0.23 (−0.36 – 0.68)	0.99 (0.97 – 1.00)
	CV	0.37 (−0.21 – 0.75)	0.31 (−0.17 – 0.70)	0.53 (0.00 – 0.82)	0.34 (−0.24 – 0.73)	0.42 (−0.16 – 0.77)	0.89 (0.63 – 0.96)
	α-DFA	−0.38 (−0.82 – 0.21)	0.06 (−0.49 – 0.56)	−0.23 (−0.72 – 0.35)	0.28 (−0.24 – 0.70)	−0.03 (−0.51 – 0.48)	0.42 (−0.15 – 0.77)
HE	Mean	0.90 (0.72 – 0.97)	0.96 (0.88 – 0.99)	0.95 (0.85 – 0.98)	0.94 (0.83 – 0.98)	0.98 (0.95 – 0.99)	0.99 (0.98 – 1.00)
	CV	0.52 (0.01 – 0.82)	0.31 (−0.18 – 0.70)	0.25 (−0.26 – 0.68)	0.74 (0.35 – 0.91)	0.52 (−0.01 – 0.82)	0.90 (0.45 – 0.97)
	α-DFA	0.30 (−0.30 – 0.71)	0.07 (−0.40 – 0.55)	−0.07 (−0.53 – 0.44)	0.46 (−0.03 – 0.78)	0.33 (−0.21 – 0.72)	0.77 (0.42 – 0.92)
PD	Mean	0.73 (0.30 – 0.91)	0.41 (−0.20 – 0.79)	0.52 (−0.06 – 0.83)	0.65 (0.16 – 0.89)	0.46 (−0.14 – 0.81)	0.98 (0.93 – 0.99)
	CV	0.06 (−0.52 – 0.60)	0.18 (−0.46 – 0.67)	0.70 (0.27 – 0.90)	0.14 (−0.49 – 0.65)	0.21 (−0.38 – 0.69)	0.58 (0.08 – 0.85)
	α-DFA	0.10 (−0.47 – 0.61)	−0.17 (−0.73 – 0.45)	0.36 (−0.25 – 0.76)	0.23 (−0.41 – 0.70)	0.04 (−0.54 – 0.59)	0.76 (0.38 – 0.92)

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