COPvel: The mean value of the instantaneous velocity of the COP in a given direction during a given time period M/L COPsd: Overall standard deviation of sway in the M/L direction in a given time period for a given number of trials COParea: An area defined by the maximum (max) anterior (ant), posterior (post), medial (med), and lateral (lat) sways during a given time period. $COParea = ( Sway max,ant + Sway max,post ) × ( Sway max,med + Sway max,lat ) T ∗ Sway max,direction = ∑ t = 0 T | COP direction,t − COP direction,mean | T MathType@MTEF@5@5@+=feaagaart1ev2aaatCvAUfKttLearuWrP9MDH5MBPbIqV92AaeXatLxBI9gBaebbnrfifHhDYfgasaacPC6xNi=xI8qiVKYPFjYdHaVhbbf9v8qqaqFr0xc9vqFj0dXdbba91qpepeI8k8fiI+fsY=rqGqVepae9pg0db9vqaiVgFr0xfr=xfr=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@C849@$ M/L COPmax: Maximum distance between the instantaneous COP position and the average COP position during a given time period.