Selection of normative group affects rates of mild cognitive impairment in Parkinson's disease Journal Article uri icon
  • OBJECTIVE: The objective of this study was to examine the impact of different methods of standardizing cognitive data in the Parkinson's Progression Marker Initiative. METHODS: Cognitive data from 423 participants with Parkinson's disease were included (age = 61.7 [9.7], education = 15.6 [3.0]). Internal norms were calculated using the group mean and standard deviation of the healthy control group. Published norms were compared to the overall group mean of and to age-stratified norms from healthy controls for each neuropsychological test over 4 visits. Rates of mild cognitive impairment were calculated using established criteria. RESULTS: The use of internal norms resulted in lower standardized scores than published norms on all tests with the exception of memory and processing speed (P

  • Link to Article
    publication date
  • 2018
  • published in
  • Movement Disorders  Journal
  • Research
  • Dementia
  • Follow-Up Studies
  • Parkinson Disease
  • Additional Document Info
  • 33
  • issue
  • 5