Table 1.

Demographic information for the subjects in study. SID refers to subject identifier. Age, education, and PD duration (time since diagnosis) are in years. DBS duration is in the number of months since the stimulators were activated. Levodopa refers to the daily dose in mg. The Unified Parkinson’s Disease Rating Scale motor score (UPDRS III) (Fahn et al., 1987) and the Hoehn and Yahr (H & Y) disease staging scores (Hoehn & Yahr, 1967) are presented for the DBS-ON and DBS-OFF examinations. Both the UPDRS III [t(6) = 2.74; p = 0.034] and the Hoehn and Yahr [t(6) = 2.52; p = 0.045] scores demonstrate significant improvements with DBS-ON. The bottom row provides group means and standard deviations (S.D.).

SID	AGE	ED	PD Duration	DBS Duration	Levodopa	UPDRS III OFF	UPDRS III ON	H & Y OFF	H & Y ON
104	57	16	16	27	400	56.5	55.5	5.0	4.0
106	59	15	10	9	600	27.5	19.0	2.5	2.5
107	62	18	15	2	600	26.0	24.0	2.5	2.0
108	61	14	11	12	600	27.0	9.0	2.0	2.0
109	49	16	9	4	300	23.5	21.5	2.5	2.0
110	62	16	11	56	600	52.5	31.0	4.0	3.0
111	56	18	11	37	400	10.5	4.0	2.0	2.0
Means (S.D.)	58.0 (4.6)	16.1 (1.5)	11.9 (2.6)	21.0 (20)	500 (129)	31.9 (16.5)	23.4 (16.8)	2.9 (1.1)	2.5 (0.8)