Table 4.

Multivariate risk analysis for SSR amplitudes of the upper and lower limbs^a.

Upper limbs	B	P	Lower limbs	B	P
Constant	4.024	<0.001	Constant	1.897	<0.001
Age	−0.040	0.003	Age	−0.020	0.002

Covariates are subtypes, gender, age, age at onset, duration, LEDD, UPDRS-III and SCOPA-AUT. LEDD, L-dopa equivalent daily dosage; PD, Parkinson's disease; SCOPA-AUT, scales for outcomes in PD-autonomic symptoms; UPDRS, unified Parkinson's disease rating scale.

^aAnalyzed by multiple linear regression.