title: Roles of Education and IQ in Cognitive Reserve in Parkinson's Disease-Mild Cognitive Impairment.
abstract: OBJECTIVE
  The role of cognitive reserve in Parkinson's disease (PD)-mild cognitive impairment (MCI) is incompletely understood.
  
  
  METHODS
  The relationships between PD-MCI, years of education, and estimated premorbid IQ were examined in 119 consecutive non-demented PD patients using logistic regression models.
  
  
  RESULTS
  Higher education and IQ were associated with reduced odds of PD-MCI in univariate analysis. In multivariable analysis, a higher IQ was associated with a significantly decreased odds of PD-MCI, but education was not.
  
  
  CONCLUSIONS
  The association of higher IQ and decreased odds of PD-MCI supports a role for cognitive reserve in PD, but further studies are needed to clarify the interaction of IQ and education and the impact of other contributors such as employment and hobbies.
authors.affiliation: Toronto Western Hospital Movement Disorders Centre and the Edmond J. Safra Program in Parkinson's Disease, Ont., Canada.
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authors.initials: MJ
authors.lastname: Armstrong
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authors.lastname: Eslinger
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authors.lastname: Zadikoff
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authors.lastname: Fox
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authors.lastname: Tang-Wai
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authors.lastname: Marras