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Mean and standard deviations of anterior-posterior (AP) and medio-lateral (ML) margins of stability (MoS), step length, width and time for steps for the contra-lateral sway (SwyC) perturbations. Black dots represent for values young adults whereas white dots represent older adults. Significant differences between pre-perturbation (PD and PND) and post-perturbation (1D to 6ND) steps are indicated with *
