Clinical criteria of the studied groups regarding cognitive impairment

VariablePD with cognitive impairment (n = 33)PD without cognitive impairment (n = 47)p value
Hoehn and Yahr (H-Y)3.4 ± 0.961.4 ± 0.5< 0.001*
UPDRS101.1 ± 34.8347.2 ± 18.27< 0.001*
BDI39.4 ± 7.158.8 ± 3.41< 0.001*
SDMT36.5 ± 5.546.7 ± 8.89< 0.001*
BVMT-R19.03 ± 4.8622.7 ± 5.570.008*
CVLT-II39.3 ± 17.1564.3 ± 7.8< 0.001*
CVLT-II delayed recall7.9 ± 4.0914.0 ± 1.57< 0.001*
MoCA score22.4 ± 3.9827.1 ± 1.42< 0.001*
HAM-A28.4 ± 11.747.1 ± 3.5< 0.001*

* Data is significant, p value < 0.05. UPDRS: Unified Parkinson’s Disease Rating Scale; BDI: Beck Depression Inventory; SDMT: Symbol Digit Modalities Test; BVMT-R: Brief Visuospatial Memory Test-Revised; CVLT-II: California Verbal Learning Test-II; MoCA: Montreal Cognitive Assessment; HAM-A: Hamilton Anxiety Rating Scale