Selection of Normative Group Affects Rates of Mild Cognitive Impairment in Parkinson's Disease.

ABSTRACT: 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 ≤ .001). Individuals were 1.5 to 2.1 times more likely to be diagnosed with mild cognitive impairment using internal norms than published norms. CONCLUSIONS:Standardization approaches with cognitive data are not interchangeable. Selection of a normative comparison group impacts research and clinical interpretations of cognitive data. © 2018 International Parkinson and Movement Disorder Society.

SUBMITTER: Wyman-Chick KA 

PROVIDER: S-EPMC5992013 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature