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Bland-Altman plot of changes in participants’ brisk speed (level-ground walking vs treadmill walking) at same set speed from day 1 today 2. Solid line indicates mean difference between two measures anddotted lines indicate 95% confidence interval (CI) (±1.96 standarddeviation) about mean agreement. Data points above and below CIwere considered outliers. VM = vector magnitude. Paul Hendrick, MPhty; et.al