Parkinson’s Disease

Research Article

Nonmotor Features in Parkinson’s Disease: What Are the Most Important Associated Factors?

Table 3

Correlation analysis between the total score of nonmotor symptoms assessed by the MDS-UPDRS Part I and variables.
VariableCorrelation coefficient value
Age0.002
Disease onset age0.940
Duration of disease<0.001
HY<0.001
SE-ADL<0.001
BDI<0.001
MMSE<0.001
PDQ-39 SI<0.001
MDS-UPDRS II<0.001
MDS-UPDRS III<0.001
MDS-UPDRS IV0.009
Duration of levodopa therapy<0.001
Daily dose of levodopa<0.001
Spearman rank coefficient.
HY, Hoehn and Yahr stage; SE-ADL, Schwab and England Activities of Daily Living Scale; BDI, Beck Depression Inventory; MMSE, Minimental State Examination; PDQ-39 SI, Parkinson’s Disease Questionnaire Summary Index; MDS-UPDRS, Movement Disorders Society’s Unified Parkinson’s Disease Rating Scale.