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- W2945235401 abstract "Background:The latent variable “δ” (for “dementia) is a transdiagnostic measure of dementia severity. δ can be reified and applied to individuals as a composite “d-score”. Like Spearman’s general intelligence factor “g”, δ can be constructed from almost any cognitive battery. So many are available that we must further distinguish each composite as a δ “homolog”. Fourteen have been validated. All are strongly associated with dementia severity and potentially with mild cognitive impairment (MCI) conversion. Objectives:To assess δ’s impact on MCI conversion risk. Methods:A new δ homolog (dDx) was constructed in 1,230 Mexican-American (MA) and 2,215 non-Hispanic White (NHW) participants in the Texas Alzheimer’s Research and Care Consortium (TARCC). 1,445 normal controls (NC) and 723 MCI were followed annually for up to 6 years. Results:Each SD decrease in the dDx score increased the risk of conversion sixteen-fold [OR = 16.39 (CI: 5.0–52.6)]. Cases below the optimal diagnostic threshold for Alzheimer’s disease (AD) versus NC were labeled as having a functionally salient cognitive impairment (FSCI). Such cases were at a 73-fold increase risk of a diagnosis of AD [OR = 73.19 (95% CI: 58.3–92.0)]. However, 25.6% of MCI cases were also FSCI(+). They accounted disproportionately for prospective conversions. Age <80 years, the absence of an ɛ4 allele, <12 years of education, and MA ethnicity independently increased the risk of diagnosing FSCI as MCI. Conclusion:A sizable minority of MCI cases may be misdiagnosed and they account disproportionately for AD conversions." @default.
- W2945235401 created "2019-05-29" @default.
- W2945235401 creator A5020890676 @default.
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- W2945235401 date "2019-07-02" @default.
- W2945235401 modified "2023-10-01" @default.
- W2945235401 title "δ Scores Identify Subsets of “Mild Cognitive Impairment” with Variable Conversion Risks" @default.
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- W2945235401 doi "https://doi.org/10.3233/jad-190266" @default.
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