Table 2. CoG sway when players stood on two legs with their eyes open and closed.

Standing on two legs	With eyes open			With eyes closed
	High-level group	Low-level group	Significant difference	High-level group	Low-level group	Significant difference
Total CoG sway path (cm)	28.9±6.8	27.3±6.9		39.3±8.4	33.6±6.3
Sway area (cm2)	26.7±9.4	24.1±12.2		44.2±27.0	41.0±16.4
Trace length per unit area (cm/cm2)	1.2±0.3	1.3±0.3		1.1±0.4	0.9±0.3
X-axis sway amplitude (cm)	15.3±3.5	14.4±3.9		22.6±6.6	17.9±4.4
Y-axis sway amplitude (cm)	21.0±5.6	19.7±5.4		26.9±6.5	24.3±5.8
Mean X-axis center displacement (cm)	−0.2±0.4	0.7±0.7	*	−0.1±0.5	0.6±0.9
Mean Y-axis center displacement (cm)	−2.0±1.5	−3.5±1.6		−2.1±1.6	−3.2±2.3

*: p<0.05