Figure 4.

(A) Group mean margin of stability at heel strike (MoS_HS) from the first to 15th recovery step with standard error. The solid horizontal black line represents the averaged MoS_HS during Normal gait; the dotted horizontal black line represents one standard deviation from Normal. *Significantly different from Normal, p < 0.0033. (B) Box plot representing the number of steps required to have one step back within normal range (nsteps_1, grey box) and the number of steps required to have at least three consecutive steps back within normal range (nsteps_3, white box). The lower (Q1) and upper quartiles (Q3) represent observations outside the 25–75th percentile range. The diagram shows the mean (crosses) and median (thick horizontal lines) for nsteps_1 and nsteps_3, respectively (for nsteps_1: median = Q1; therefore, the line of nsteps_1 overlays the one of Q1). Data falling outside Q1 and Q3 are outliers.