TABLE 2.

Results of a Multivariate Linear Regression, Including All Control Variables and Parkinson’s Disease Medication Use^a

	Proportion of Patients Taking	B	Standard Error	β	p
Constant	—	1.08	4.86	—	NS
Age, years	—	0.10	0.05	0.14	0.047
Female sex	—	2.30	1.01	−0.16	0.024
Education, years	—	0.23	0.16	−0.10	NS
Disease duration, months	—	0.00	0.01	0.01	NS
Beck Depression Inventory	—	3.279	0.41	0.57	<0.001
Carbidopa/Levodopa	82%	0.05	0.04	0.09	NS
Dopamine agonistsb	44%	1.14	0.93	−0.08	NS
Amantadine	16%	1.00	1.28	0.05	NS
Selegiline/Rasagiline	21%	2.59	1.19	−0.15	0.032
Memantine	3%	3.06	2.73	−0.07	NS
Entacapone	20%	0.62	1.18	0.04	NS

^aR²=0.45 (p<0.001); N=143.

^bPramipexole, ropirinole, rotigotine.