Table 3.

Stability of MDS categorization of Parkinson's disease, comparing baseline and 2.5 years' follow-up.

Baseline analysis	Follow-up analysis
	Not PD	Probable PD	Established PD	% probable or established PD
Not PD N = 165	156	9	0	5.5%
Probable PD N = 574	75	352	147	86.9%
Established PD N = 1261	133	152	976	89.5%

MDS = Movement Disorder Society, PD = Parkinson's disease.