Table 2.

Parameters used to power the study

Measurement		TFT			PAL
Parameters		6 MWT (m)	TST (s)	TUG (s)	Step/day
Within-subject SD, σ		30.1	1.62	1.59	698
Superiority margin, MDC		65.4	3.47	3.50	1582
Hypothesize change, Δ		87.4	5.47	4.80	2082
Effect, δ  =  Δ-MDC		22.0	2.00	1.30	500
Required sample	N	25	10	26	26

MDC Minimal detectable change, TFT Timed functional test

TUG Timed up and go test, 6 MWT 6 min walk test, TST timed stair test

PAL Physical activity level measured with Actigraph monitor