Table 1.

Detectable mean change in outcome measures for sample size of n=20 at 0.05 significance level with 0.80 power

Variable	CV (%) or SD of change	Detectable change
TUG	46%	30%
First 10 feet walk speed during TUG (cm/s)	15.2	11.6
TUG–short step length (cm)	8.2	6.3
TUG–long step length (cm)	9.2	7.1
1/TUG step duration (step/s)	0.25	0.19
T25FW speed (cm/s)	13.4	10.3

Abbreviations: CV, coefficient of variation; SD, standard deviation; TUG, timed up and go; T25FW, timed 25-foot walk.