Table 2.

Degree of SDD Severity and Slip Severity

SDD Measure/Group Difference	Slow Walkers				Fast Walkers
	Unadjusted		Adjusted for Age	Unadjusted		Adjusted for Age
	[Correlation] or Mean Difference ± SE	p Value	[Correlation] or Mean Difference ± SE	p Value	[Correlation] or Mean Difference ± SE	p Value	[Correlation] or Mean Difference ± SE	p Value
Caudate nucleus
Numeric BPIT value	[.15]	.4645	[.06]	.7586	[−.34]	.1010	[−.47]	.0239
Overall three-group comparison	—	.0593	—	.0882	—	.0393	—	.0037
Mild vs moderate	0.25 ± 0.23	.2868	0.26 ± 0.28	.3569	−0.55 ± 0.25	.0417	−0.97 ± 0.29	.0031
Mild vs severe	0.31 ± 0.21	.1522	0.30 ± 0.30	.3306	−0.72 ± 0.28	.0167	−1.19 ± 0.32	.0013
Moderate vs severe	0.56 ± 0.23	.0202	0.56 ± 0.24	.0299	−0.17 ± 0.25	.5212	−0.22 ± 0.23	.3563
Putamen
Numeric BPIT value	[.08]	.6932	[−.04]	.8579	[−.23]	.2720	[−.36]	.0889
Overall three-group comparison	—	.4399	—	.5652	—	.3678	—	.1588
Mild vs moderate	0.33 ± 0.26	.2261	0.26 ± 0.34	.4587	−0.35 ± 0.28	.2162	−0.72 ± 0.38	.0734
Mild vs severe	0.05 ± 0.22	.8159	−0.02 ± 0.31	.9560	−0.40 ± 0.32	.2216	−0.81 ± 0.43	.0752
Moderate vs severe	−0.27 ± 0.25	.2899	−0.27 ± 0.26	.3040	−0.05 ± 0.29	.8694	−0.09 ± 0.29	.7501

Note: BPIT = bolus-plus-infusion transformation; SDD = striatal dopaminergic denervation.