Table 4.

Mean±SD scores of selected items of Unified Parkinson’s Disease Rating Scale (UPDRS-III), dyskinesia scores (UPDRS-IV) and levodopa-equivalent daily doses (LEDD), at baseline and at 6 months in medical group on-medication/off-medication, and in surgical group on-medication/off-medication on-stimulation/off-stimulation

	Medical group				Surgical group
	Baseline		6 months		Baseline		6 months
	Off-medication	On-medication	Off-medication	On-medication	Off-medication	On-medication	Off-medication off-stimulation	On-medication off-stimulation	Off- medication on-stimulation	On-medication on-stimulation
Tremor (items 20–21)	8.3±6.4	2.1±3.9	6.9±5.6	2.7±4.7	5.1±3.4	2.3±4.2	6.1±4.6	2.1±4.2	0.4±0.5	0.4±0.8
Speech (item 18)	1.3±0.7	0.9±0.5	1.2±0.8	0.7±0.5	1.2±0.7	0.8±0.7	1.3±0.7	1±0.7	1.2±0.7	0.9±0.6
Akinesia (items 22–26)	15.8±5.6	9.1±5.1	14.4±4.4	7.9±5.4	14.3±6.6	10±6.1	15.7±6.3	9.1±3.3	9.7±5	10.1±6.6
Axial (items 27–31)	4.4±2.4	1.4±1.3	3.9±2.8	1.8±1.8	2.8±1.9	1.3±1	2.4±1.9	1.4±1.2	2.0±1.4	1.8±2.0
Dyskinesia		1.7±2.9		1.5±2.6		1.5±2.1				1.1±0.3
LEDD (mg)		1043±516		1180±548		1376±883*				1054±488*

Significant P values:

Medical group off-medication vs surgical group off-medication on-stimulation: tremor P=0.001; akinesia: P=0.015.

Surgical group off-medication scores at baseline vs off-medication on-stimulation scores at 6 months: tremor P=0.002; akinesia: P=0.026.

*One patient in surgical group had 8 mg of trihexyphenidyl, both at baseline and at 6 months follow-up.