Table 1.

Demographic and clinical information

	Mean (SD)
Age	64 (7.5)
Education (years)	15 (2.6)
Disease duration (years)	3.7 (1.8)
Time since surgery (months)	14.3 (7.7)
Levodopa equivalent dose	331 (192.7)
UPDRS III on DBS and dopaminergic medication	23.3 (10.9)
UPDRS III off DBS and dopaminergic medication	42.3 (13.7)
Baseline DRS-2	14.3 (1.0)
WTAR	111.4 (9.6)
WAIS	112.1 (10.8)
Baseline BDI-II	6.1 (4.1)
POMS
DBSon	60.7 (10.6)
DBSoff	66.7 (5.5)

BDI-II: Beck Depression Inventory II, DRS-II: Dementia Rating Scale II, POMS: profile of mood states, UPDRS III: Unified Parkinson Disease Rating Scale motor section, WASI: Wechsler Abbreviated Scale of Intelligence, WTAR: Wechsler Test of Adult Reading