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Bland-Altman plot of changes in participants’ normal speed (level-ground walking vs treadmill walking) at same set speed on day 1.Solid line indicates mean difference between two measures and dottedlines indicate 95% confidence interval (CI) (±1.96 standard deviation)about mean agreement. Data points above and below CI were consid-ered outliers. VM = vector magnitude. Paul Hendrick, MPhty; et.al