Quantitative Analysis of Postural Balance in Faller and Nonfaller Patients with Parkinson’s Disease

Table 3

Correlation coefficients between COP outcome measures and clinical scores.

COP outcome measures	Directions	UPDRS III	Fear of falling score	Tinetti_balance score
Mean velocity (mm/s)	Overall	0.081	0.330	−0.427
	AP	0.143	0.350	−0.420
	ML	0.012	0.305	−0.409
Mean distance (mm)	Overall	0.084	0.231	−0.366
	AP	0.118	0.169	−0.236
	ML	0.009	0.264	−0.464
Mean frequency (Hz)	Overall	0.074	0.232	−0.135
	AP	0.096	0.273	−0.281
	ML	−0.012	0.053	0.094
Peak frequency (Hz)	Overall	−0.180	0.182	−0.091
	AP	0.151	0.075	0.034
	ML	−0.013	−0.027	0.230
Peak power (mm^2/Hz)	Overall	0.123	0.336	−0.453
	AP	0.116	0.383	−0.396
	ML	−0.006	0.326	−0.397
Sway area		0.021	0.283	−0.428

Note: COP, center of pressure; SD, standard deviation; AP, anterio–posterior; ML, medio–lateral; ,  < 0.05; ,  < 0.01. Bold values: P < 0.05.