Table 1.

Patient characteristics

Subject no.	Target	Age (yr)	Gender	Off UPDRS Part IIIa	Primary reason for surgery
1	L GPi	76	M	36	Upper extremity tremor
2	L STN	76	M	48	Upper extremity tremor
3	L GPi	56	M	39	On-medication dyskinesia
4	R GPi	59	M	NA	Upper extremity tremor
5	R STN	68	F	NA	Upper extremity tremor
6	L GPi	70	M	49	Forward leaning posture
7	R GPi	49	M	42	Arm and leg motor fluctuations
8	R GPi	46	M	66	Rigidity and bradykinesia
	L GPi	47		66
9	R GPi	73	M	26	Dyskinesia and impaired speech
10	L STN	59	M	38	Upper extremity tremor
	R STN	59		38
11	L GPi	59	M	39	Dystonia
12	L GPi	72	M	9	Lower extremity tremor
13	R STN	67	F	45	Upper extremity tremor
14	L GPi	72	M	30	Rigidity and bradykinesia
15	L GPi	78	F	35	Upper extremity tremor
16	L STN	68	M	37	Bradykinesia
17	L GPi	65	M	43	Freezing
18	L STN	80	M	43	Upper extremity tremor
	R STN	81		46
19	L GPi	71	F	41	Motor fluctuations
20	R GPi	81	M	39	Tremor
21	L STN	56	M	33	Upper extremity tremor
22	R GPi	77	F	22	Dyskinesia
23	L GPi	53	M	31	Impulse control disorder
24	L GPi	44	F	55	Bradykinesia and rigidity
	R GPi	44		55
25	R STN	65	M	62	Upper extremity tremor
26	L GPi	64	M	29	Freezing
	R GPi	64		29
27	L GPi	77	M	20	Upper extremity tremor
28	L GPi	68	F	33	Upper extremity tremor
29	L STN	60	M	42	Motor fluctuations
	R STN	61		42
30	R STN	65	F	51	Upper extremity tremor
31	R GPi	73	M	34	Upper extremity tremor
	L GPi	73		34
32	L STN	63	M	21	Upper extremity tremor
33	R GPi	44	F	32	Motor fluctuations
34	L STN	64	M	43	Upper and lower extremity tremor
35	R STN	78	M	36	Upper extremity tremor
36	L STN	76	M	37	Upper extremity tremor
37	R STN	73	M	31	Upper extremity tremor
	L STN	73		31

^aTotal UPDRS was not significantly different in the STN and GPi groups by Student's t test (t₍₄₁₎ = 0.84, p = 0.41).