Fig. 2.

The balance ability under single task and dual tasks in the control and MCI groups. Note. D-ap = the maximal displacement of COP in the AP direction; D-ml = the maximal displacement of COP in the ML direction; RMS = Root mean squared; RMS-ml = Root mean squared in the ML direction; RMS-ap = Root mean squared in the AP direction; 95%AREA = 95% confidence ellipse area; SP = Sway Path; SP-ml = Sway Path in the ML direction; SP-ap = Sway Path in the AP direction. a, significant difference between groups. b, significant difference between tasks. *p < 0.05