Cognitive function and psychological well-being: findings from a population-based cohort.
BACKGROUND
depression is associated with poor cognitive function, though little is known about the relationship between psychological well-being and cognitive function.


OBJECTIVE
to investigate whether psychological well-being is associated with levels of cognitive function.


METHODS
nationally representative population-based cohort study.


METHODS
11,234 non-institutionalised adults aged 50 years and over of the English Longitudinal Study of Ageing in 2002.


METHODS
psychological well-being was measured using the CASP-19, and cognitive function was assessed using neuropsychological tests of time orientation, immediate and delayed verbal memory, prospective memory, verbal fluency, numerical ability, cognitive speed and attention. The relation of psychological well-being to cognitive function was modelled using linear regression.


RESULTS
on a global cognitive score combining all cognitive tests, those in the fifth quintile of psychological well-being scored an average of 0.30 SD units higher than those in the lowest quintile (95% CI 0.24-0.35) after adjustment for depressive symptoms and sociodemographics. This association remained after additional adjustment for physical health and health behaviours. The same pattern of association was observed for men and women, and across all cognitive domains.


CONCLUSIONS
in a large population of community living adults, higher levels of psychological well-being were associated with better cognitive function.
Llewellyn
David J
DJ
Department of Public Health and Primary Care, Forvie Site, University of Cambridge, Cambridge CB2 2SR, UK. dl355@medschl.cam.ac.uk
Lang
Iain A
IA
Langa
Kenneth M
KM
Huppert
Felicia A
FA
D000368:Aged; D000369:Aged, 80 and over; D001288:Attention / Q000502:physiology; D003071:Cognition / Q000502:physiology*; D015331:Cohort Studies; D005260:Female; D006306:Health Surveys; D006801:Humans; D016014:Linear Models; D008137:Longitudinal Studies; D008297:Male; D008568:Memory / Q000502:physiology; D008603:Mental Health; D008875:Middle Aged; D009483:Neuropsychological Tests; D009949:Orientation / Q000502:physiology; D010549:Personal Satisfaction