. Author manuscript; available in PMC: 2017 Feb 17.

Published in final edited form as: Mov Disord. 2015 Sep 12;31(3):317–324. doi: 10.1002/mds.26417

TABLE 2.

Correlations between MRI and clinical measures

		Age	Duration	UPDRS I	UPDRS II	UPDRS III	Total UPDRS	LEDD
QSM	r	0.073	*0.423*	0.123	*0.345*	−0.020	0.177	*0.415*
	P-value	(0.626)	*(0.003)*	(0.409)	*(0.018)*	(0.892)	(0.234)	*(0.004)*
R2*	r	0.213	0.248	0.053	0.202	0.093	0.163	0.123
	P-value	(0.150)	(0.093)	(0.723)	(0.174)	(0.532)	(0.275)	(0.409)

Correlations between MRI and clinical measures were assessed using partial Spearman correlation with adjustments of age and sex. Table shows the r and associated P values (in parentheses). Bold italic indicates statistically significant correlations.

MRI, magnetic resonance imaging; UPDRS, Unified Parkinson’s Disease Rating Scale; LEDD, levodopa-equivalent daily dose; QSM, quantitative susceptibility mapping.