Fig 4. Group mean values of the peak power, peak power frequency (PPF), and mean power frequency (MPF) of the center of mass acceleration (COM_acc).

Group mean values of the unnormalized peak power (a), normalized peak power (b), peak power frequency (c) and mean power frequency (d) of the COM_acc for each age group and visual condition. White and black bars indicate the results for child and adult groups, respectively. Data are group means ± SD. *, **, and *** indicate statistical significances of P < 0.05, P < 0.01, and P < 0.001, respectively, between age groups. # and ## indicate statistical significance of P < 0.05 and P < 0.01, respectively, between visual conditions.