Table 1.

Demographic and clinical characteristics of the studied groups.

Variable	PD (n=84)	CG (n=59)	p
Age at evaluation, y	67.8±10.4	60.4±12.7	<0.001#
Gender, M % (n)	64.3% (54)	42.4% (25)	0.009^
MMSE	28.2±2.0	29.3±0.6	0.126#
UPDRS-III	15.1±7.5	-	-
L Caudate binding	1.58±0.44	2.61±0.43	<0.001°
R Caudate binding	1.69±0.50	2.79±0.42	<0.001°
L Putamen binding	1.14±0.51	2.71±0.40	<0.001°
R Putamen binding	1.10±0.52	2.62±0.45	<0.001°

Abbreviations and symbols: M, male; MMSE, Mini Mental State Examination; PD, Parkinson’s Disease; CG, control group (DAT negative subjects); y, years; UPDRS-III, Unified Parkinson Disease motor score

^#t student test;

^{^}chi square test

^°Univariate General Linear Model considering age and gender as nuisance variables. Caudate and Putamen bindings are expressed as ratio to occipital region of interest (ROI).