Table 1.

Non-parametric analysis comparing baseline variables in patients receiving unilateral or staged bilateral STN DBS

Variable	All Subjects at Baseline	Unilateral STN DBS		Staged Bilateral STN DBS		p-value
	Mean ± SD	N	Mean ± SD	N	Mean ± SD
Age at First Surgery	59.9 ± 9.8	51	60.2 ± 9.5	28	59.3 ± 10.4	0.8421
Weight (kg)	81.5 ± 19.9	48	86.0 ± 18.6	23	72.2 ± 18.8	0.0076*
Total UPDRS	71.3 ± 15.5	53	69.0 ± 14.4	27	75.9 ± 16.7	0.0883
UPDRS Part 1	2.6 ± 1.8	54	2.6 ± 1.6	27	2.7 ± 2.2	0.9273
UPDRS Part 2 ‘off’	24.3 ± 6.1	54	23.7 ± 5.8	27	25.6 ± 6.6	0.1940
UPDRS Part 2 ‘on’	8.8 ± 5.1	53	8.6 ± 4.9	27	9.3 ± 5.5	0.5833
UPDRS Part 3 ‘off’	36.6 ± 10.8	54	34.8 ± 9.8	28	40.0 ± 11.8	0.0645
UPDRS Part 3 ‘on’	12.7 ± 7.5	53	12.4 ± 6.9	28	13.3 ± 8.5	0.8312
UPDRS Part 4	8.2 ± 2.5	53	8.2 ± 2.5	27	8.2 ± 2.6	0.9632
Tremor Subscore	6.8 ± 6.2	53	5.9 ± 4.9	27	7.4 ± 5.1	0.1770
Dyskinesia Subscore	2.4 ± 2.0	53	2.6 ± 2.1	27	2.0 ± 1.7	0.3420
Asymmetry index	0.4 ± 0.2	53	0.5 ± 0.2	28	0.3 ± 0.2	0.0047*