Table 1.

Baseline characteristics (n = 487).

	Mean	SD	Range
Age	61.07	9.70	33 – 84
Education	15.48	3.10	5 – 26
% Male	65.10	--	--
% Caucasian	95.00	--	--
UPDRS-III Motor	20.03	9.20	2 – 51
GDS-15	2.46	2.60	0 – 14
Apathy	0.46	0.60	0 – 3
Global Cognition	0.01	0.60	−1.8 – 1.4
LNS	10.49	2.67	2 – 20
SDMT	41.19	10.02	7 – 82
Animal Fluency	20.75	5.46	8 – 41
JOLO	12.77	2.16	5 – 15
HVLT-R Immediate	24.42	4.90	9 – 36
HVLT-R Delay	8.34	2.55	0 – 12

Notes. Raw values are depicted, with the exception of the Global Cognition composite z-score. UPDRS = Unified Parkinson’s Disease Rating Scale; GDS-15 = 15-item Geriatric Depression Scale; LNS = Letter-Number Sequencing; SDMT = Symbol Digit Modalities Test; JOLO = Judgment of Line Orientation; HVLT-R = Hopkins Verbal Learning Test – Revised.