Table 1.

Demographic variables of responding Parkinson’s disease patients

	PD pts, total (n = 3326)	PD pts, advanced (n = 1300)
Mean age	71 (35–100) years	71 (39–100) years
Females/Males	43%/57%	43%/57%
Median PD duration	8 (1–46) years	11 (5–46) years

Abbreviations: PD, Parkinson’s disease; pts, patients.