Table 2.

Health-related quality of life scores: correlation with the continuous variables’ scores (n = 169)

Variable (at the time of follow-up)	PDQ-8 score
	r *	p value
Age (n = 168)	-0.07	0.4019
Age of PD onset	-0.14	0.0791
PD duration (n = 168)	0.14	0.0695
Number of pills/day	0.21	0.0071
LEDD	0.25	0.0010

^*Pearson correlation coefficients (Prob > |r| under H0: Rho = 0).

LEDD, levodopa equivalent daily dose; PD, Parkinson’s disease; PDQ, Parkinson’s Disease Questionnaire.