Table 2. Changes in static balance ability.

Variables	PG (n=10)	CG (n=9)
M-L COP range (mm)
Pre	10.85 ± 5.0	11.72 ± 5.4
Post	7.11 ± 2.2	16.10 ± 6.1
Pre-Post	−3.74 ± 3.3*	1.61 ± 3.0†
A-P COP range (mm)
Pre	14.75 ± 8.0	16.10 ± 6.1
Post	10.47 ± 3.7	16.82 ± 5.0
Pre-Post	−4.28 ± 4.9*	0.72 ± 4.6†
M-L COP velocity (mm/s)
Pre	83.94 ± 42.1	84.24 ± 45.0
Post	66.48 ± 26.6	86.69 ± 41.9
Pre-Post	−17.46 ± 24.4*	2.45 ± 4.8†
A-P COP velocity (mm/s)
Pre	122.00 ± 47.6	130.48 ± 45.8
Post	104.55 ± 42.0	135.78 ± 43.2
Pre-Post	−17.45 ± 11.9*	5.30 ± 7.2†††

A-P COP: anterior-posterior center of pressure; M-L COP: medial-lateral center of pressure. Values are expressed as mean ± standard deviation (SD). *Means significant difference within group; †Means significant difference between groups