Correlation between baseline characteristics of the studied groups and cognitive impairment

VariablePD with cognitive impairment (n = 33)PD without cognitive impairment (n = 47)p value
Age (years)Mean ± SD71.8 ± 4.5849.7 ± 6.22< 0.001*
SexMale20 (60.61%)28 (59.57%)0.926
Female13 (39.39%)19 (40.43%)
ResidenceRural17 (51.52%)21 (44.68%)0.547
Urban16 (48.48%)26 (55.32%)
EducationLiterate5 (15.15%)26 (55.32%)< 0.001*
Illiterate28 (84.85%)21 (44.68%)
Smoking10 (30.3%)19 (40.43%)0.406
Duration of illness (years)7.3 ± 2.286.2 ± 1.980.024*

* Data is significant; p value < 0.05. PD: Parkinson’s disease