Table 1

 Characteristics of groups in the two cluster solution

Young onset groupOlder onset groupANOVA
F valuep Value
ANOVA, analysis of variance.
Mean age at onset (years)59.169.219.70<0.0001
Mean Hoehn and Yahr score2.52.31.62NS
Mean disease progression (Hoehn and Yahr score per year)0.410.875.93<0.05
Mean levodopa dose (mg/d)645.6256.2164.18<0.0001
Mean mini-mental state examination score27.425.91.90NS
Mean Beck depression score14.79.74.14<0.05