Control Group (n=20) Early PD patients Group (n=15) Intermediate PD patients Group (n=15) Age (years) 63.2 ±9.01 63.7 ±9.27 66.03 ±9.63 Gender (male) 12 8 8 Disease duration (years) - 3.61 ± 1.98 8.25 ± 3.30 Motor exam (UPDRS -Section III) - 7.15 ± 3.26 22.25 ± 7.20 Mini-Mental State Examination 28.2± 1.2 27.3± 1.6 26.7± 1.9

Table 1: Age, as expressed by the mean number (+ standard deviation) of years, number of male subjects per group and scores achieved in the Mini-Mental Examination, by the Control participants and Early PD and Intermediate PD patients.