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- W2311427096 abstract "Normative samples drawn from older populations may unintentionally include individuals with preclinical Alzheimer's disease (AD) pathology, resulting in reduced means, increased variability, and overestimation of age effects on cognitive performance. A total of 264 cognitively normal (Clinical Dementia Rating = 0) older adults were classified as biomarker negative (“Robust Normal,” n = 177) or biomarker positive (“Preclinical Alzheimer's Disease” [PCAD], n = 87) based on amyloid imaging, cerebrospinal fluid biomarkers, and hippocampal volumes. PCAD participants performed worse than robust normals on nearly all cognitive measures. Removing PCAD participants from the normative sample yielded higher means and less variability on episodic memory, visuospatial ability, and executive functioning measures. These results were more pronounced in participants aged 75 years and older. Notably, removing PCAD participants from the sample significantly reduced age effects across all cognitive domains. Applying norms from the robust normal sample to a separate cohort did not improve Clinical Dementia Rating classification when using standard deviation cutoff scores. Overall, removing individuals with biomarker evidence of preclinical AD improves normative sample quality and substantially reduces age effects on cognitive performance but provides no substantive benefit for diagnostic classifications." @default.
- W2311427096 created "2016-06-24" @default.
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- W2311427096 date "2016-07-01" @default.
- W2311427096 modified "2023-10-14" @default.
- W2311427096 title "Certified normal: Alzheimer's disease biomarkers and normative estimates of cognitive functioning" @default.
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- W2311427096 doi "https://doi.org/10.1016/j.neurobiolaging.2016.03.014" @default.
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