Table 1. The proportions of COP_ML %power in each band.

	LFB (%)		MFB (%)		HFB (%)
	AMTS	DMTS	AMTS	DMTS	AMTS	DMTS
Mean	52.5	56.8	45.8	42.8	1.7	0.4	**
SD	20.9	18.0	19.8	17.9	1.4	0.3

COP_ML: mediolateral components of COP; LFB: low-frequency band; MFB: mid-frequency band; HFB: high-frequency band; AMTS: participants who had the ability to maintain the tandem stance for 20s; DMTS: participants who had the difficulty maintaining the tandem stance for 20s; SD: standard deviation; **p<0.01