Table 2

 Characteristics of groups in the three cluster solution

Young onset groupOlder onset groupOlder onset group with cognitive impairment and rapid progressionANOVA
F valuep Value
ANOVA, analysis of variance.
Mean onset (years)51.764.873.524.59<0.0001
Mean Hoehn and Yahr score2.62.32.40.89NS
Mean disease progression (Hoehn and Yahr score per year)0.330.541.186.74<0.01
Mean levodopa dose (mg/d)870428.6134.8150.50<0.0001
Mean mini-mental state examination score28.327.423.66.78<0.01
Mean Beck depression score17.39.313.43.33<0.05