Table 1.

Demographic and disease characteristics of the study participants. Means (±standard deviation) are shown.

	STN DBS
Age	59.8 (10.0)
Gender (% Male)	69.2
Disease Duration (years)	13.3 (4.0)
Hoehn and Yahr “off” stage (percent)	2: 8.3
	2.5: 29.2
	3: 37.5
	4: 25.0
	5: 0.0
Mean LED before surgery	935.9 (373.9)
Preoperative “on” UPDRS III score	22.5 (8.2)
Preoperative “off” UPDRS III score	45.2 (12.6)
Mini-Mental State Exam (max: 30)	28.0 (1.8)
Dementia Rating Scale (max: 144)	136.5 (7.0)
Beck Depression Inventory (max: 63)	10.4 (5.9)
Verbal Fluency Task Scores (raw)
Letter	38.1 (11.7)
Semantic	18.3 (4.7)

LED- Levodopa equivalent dosage