Group mean values of SD of center of foot pressure (COP), and center of mass acceleration (COM_acc).

<p>Group mean values of unnormalized SD of COP (<i>a</i>) and COM_acc (<i>b</i>) for each age group and visual condition, and normalized COP (<i>c</i>) and COM_acc (<i>d</i>). <i>White</i> and <i>black bars</i> indicate child and adult groups, respectively. Data are group means ± SD. *** and **** indicate statistical significances of <i>P</i> < 0.001 and <i>P</i> < 0.0001, respectively, between age groups. ## and ### indicate statistical significances of <i>P</i> < 0.01 and <i>P</i> < 0.001, respectively, between visual conditions.