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Int J Geriatr Psychiatry. 2016 Jun;31(6):601-10. doi: 10.1002/gps.4366. Epub 2015 Oct 15.

The role of cognitive reserve on terminal decline: a cross-cohort analysis from two European studies: OCTO-Twin, Sweden, and Newcastle 85+, UK.

Author information

1
MRC Unit for Lifelong Health and Ageing at University College London, London, UK.
2
Institute of Health and Society, Newcastle University, Newcastle, UK.
3
Department of Psychology, University of Gothenburg, Gothenburg, Sweden.
4
Department of Psychology, University of Victoria, Victoria, Canada.

Abstract

OBJECTIVE:

Cognitive performance shows a marked deterioration in close proximity to death, as postulated by the terminal decline hypothesis. The effect of education on the rate of terminal decline in the oldest people (i.e. persons 85+ years) has been controversial and not entirely understood. In the current study, we investigated the rate of decline prior to death with a special focus on the role of education and socioeconomic position, in two European longitudinal studies of ageing: the Origins of Variance in the Old-Old: Octogenarian Twins (OCTO-Twin) and the Newcastle 85+ study.

METHODS:

A process-based approach was used in which individuals' cognitive scores were aligned according to distance to death. In a coordinated analysis, multilevel models were employed to examine associations between different markers of cognitive reserve (education and socioeconomic position) and terminal decline using the mini-mental state examination (MMSE), controlling for age at baseline, sex, dementia incidence and time to death from the study entry to the time of death within each cohort.

RESULTS:

The current findings suggest that education was positively associated with higher MMSE scores prior to death in the OCTO-Twin, but not in the Newcastle 85+ study, independent of socioeconomic position and other factors such as baseline age, sex and time to death from the study entry. However, education was not associated with the rate of terminal decline in both of these studies.

CONCLUSIONS:

Our results offer only partial support to the cognitive reserve hypothesis and cognitive performance prior to death.

KEYWORDS:

MMSE; cognition; cognitive reserve; death; dementia; education; longitudinal study; mixed multilevel; terminal decline

PMID:
26471722
PMCID:
PMC4833688
DOI:
10.1002/gps.4366
[Indexed for MEDLINE]
Free PMC Article

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