Table 3.

Number of gait cycles needed reach correlation coefficient of R > 0.8 compared to 40 gait cycles in healthy elderly (HE) and subjects with movement disorders (MD).

	N to reach R > 0.8	Average at Nth GC (±SD)	Number (%) of subjects with increased CoV (>2.6%) at n	Average parameter after 40 GC (±SD)	Number (%) of subjects with increased CoV (>2.6%) at 40 GC
HE Stride length [%stature]	3	86.54 ± 5.01	n.a.	86.13 ± 4.83	n.a.
HE CoV Stride length	16	1.85% ± 0.86	21/162 (13%)	1.99 % ± 0.90	23/162 (14%)
HE Stride time [seconds]	3	1.029 ± 0.07	n.a.	1.021 ± 0.062	n.a.
HE CoV Stride time	20	1.90% ± 0.69	20/162 (12%)	2.10 % ± 0.68	30/162 (19%)
MD Stride length [%stature]	3	77.15 ± 6.94	n.a.	76.99 ± 7.04	n.a.
MD CoV Stride length	11	3.03% ± 1.69	17/31 (55%)	3.41 % ± 2.17	16/31 (52%)
MD Stride time [seconds]	3	1.02 ± 0.10	n.a.	1.032 ± 0.10	n.a.
MD CoV Stride time	10	3.02% ± 1.63	17/31 (55%)	3.54 % ± 2.22	19/31 (61%)
ATX Stride length[%stature]	3	76.18 ± 7.46	n.a.	76.06 ± 7.00	n.a.
ATX CoV Stride length	10	4.47% ± 2.79	5/7 (71%)	5.61 % ± 3.30	7/7 (100%)
ATX Stride time [seconds]	3	1.09 ± 0.14	n.a.	1.12 ± 0.20	n.a.
ATX CoV Stride time	8	4.28% ± 2.58	4/7 (57%)	5.65 % ± 3.64	6/7 (85%)
ET Stride length [%stature]	3	78.11 ± 6.73	n.a.	78.50 ± 6.66	n.a.
ET CoV Stride length	20	2.63% ± 0.72	5/12 (42%)	2.74 % ± 0.87	6/12 (50%)
ET Stride time [seconds]	3	1.021 ± 0.076	n.a.	1.02 ± 0.07	n.a.
ET CoV Stride time	18	3.20% ± 1.08	7/12 (58%)	3.14 % ± 1.13	7/12 (58%)
PD Stride length [%stature]	3	76.74 ± 6.41	n.a.	76.02 ± 7.45	n.a.
PD CoV Stride length	10	2.44% ± 0.97	4/12 (33%)	2.81 % ± 1.47	3/12 (25%)
PD Stride time [seconds]	3	0.979 ± 0.05	n.a.	0.99 ± 0.05	n.a.
PD CoV Stride time	19	2.24% ± 0.81	4/12 (33%)	2.70 % ± 1.07	6/12 (50%)

ATX – patients with ataxia; CoV – coefficient of variation; ET – patients with essential tremor; GC – gait cycle; HE – healthy elderly; MD – neurological disorders with motor impairment; PD – patients with Parkinson’s disease; SD – standard deviation.