Table 4 Values for the group mean error ( me ), mean standard deviation of the subject error ( sde ), mean absolute error ( mae ) and the percent of it ( %mae ) in estimating stride length for the four (healthy elderly – E, hemiparetic – H, Parkinson’s disease – P and choreic – C)

E

2 (19)

0 (19)

18

15

1%

1%

H

−6 (27)

−11 (22)

21

20

3%

3%

P

4 (21)

1 (19)

18

16

2%

2%

C

−8 (29)

−7 (31)

26

24

2%

2%