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Examining trends in dementia incidence and prevalence using an age-period-cohort framework 

Examining trends in dementia incidence and prevalence using an age-period-cohort framework
Chapter:
Examining trends in dementia incidence and prevalence using an age-period-cohort framework
Author(s):

Kenneth M Langa

, Eileen M Crimmins

, and Mark D Hayward

DOI:
10.1093/med/9780198749493.003.0004
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date: 19 October 2021

Dementia, a decline in memory and cognition leading to disability in daily function, is a common and feared geriatric condition. Over the past decade, dementia has been the focus of increasing attention from researchers, clinicians, and policymakers due to the projected significant increase in the number of dementia cases expected to result from the worldwide growth in the elderly population. Given the growing evidence that late-life dementia risk likely results from the summation of risk and protective factors that individuals experience across the life course from birth (even pre-birth) through old age, an ‘age-period-cohort’ perspective which clarifies trends in dementia using each of these different lenses may help in identifying potential causal pathways that affect dementia risk. In this chapter, we review recent literature on trends in dementia incidence and prevalence in countries around the world, discuss hypothesized causes for those trends, and present new data on recent trends in dementia incidence and prevalence in the USA.

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