UPDRSm: motor part of the UPDRS scale; H&Y: Hoehn and Yahr scale; ADL: Activities of daily living scale; SD: standard deviation.
* p value for the comparison of allele frequencies between PD patients and controls.
** p value for the comparison UPDRSm, UPDRS total, H&Y, ADL and age at onset between PD patients of different genotype groups (DD, DI, II).
*** p value for the comparison UPDRSm, UPDRS total, H&Y, ADL and age at onset between PD patients of different genotype groups (DD vs DI and II).
D/I: deletion/insertion polymorphism; PD: Parkinson’s disease.