Educational inequalities in aging-related declines in fluid cognition and the onset of cognitive pathology

Sean A P Clouston*, M. Maria Glymour, Graciela Muñiz Terrera

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Education has been robustly associated with cognitive reserve and dementia, but not with the rate of cognitive aging, resulting in some confusion about the mechanisms of cognitive aging. This study uses longitudinal data to differentiate between trajectories indicative of healthy versus pathologic cognitive aging. Methods: Participants included 9401 Health and Retirement Study respondents aged ≥55 years who completed cognitive testing regularly over 17.3 years until most recently in 2012. Individual-specific random change-point modeling was used to identify age of incident pathologic decline; acceleration is interpreted as indicating likely onset of pathologic decline when it is significant and negative. Results: These methods detect incident dementia diagnoses with specificity/sensitivity of 89.3%/44.3%, 5.6 years before diagnosis. Each year of education was associated with 0.09 (95% confidence interval [CI], 0.087-0.096; P <.001) standard deviation higher baseline cognition and delayed onset of cognitive pathology (hazard ratio, 0.98; 95% CI, 0.96-0.99; P = .006). Conclusions: Longitudinal random change-point modeling was able to reliably identify incident dementia. Accounting for incident cognitive pathology, we find that education predicts cognitive capability and delayed onset pathologic declines.

Original languageEnglish
Pages (from-to)303-310
Number of pages8
JournalAlzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring
Volume1
Issue number3
DOIs
Publication statusE-pub ahead of print - 28 Jun 2015

Keywords

  • Aging
  • Cognitive reserve
  • Dementia
  • Educational status
  • Neurology
  • Social medicine

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