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Epidemiology of dementia 

Epidemiology of dementia
Chapter:
Epidemiology of dementia
Author(s):

Thais Minett

and Carol Brayne

DOI:
10.1093/med/9780199655946.003.0020
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date: 30 May 2020

The world population is ageing extremely quickly and is leading to a dramatic rise in frailty and chronic conditions. Dementia is a condition which places a considerable pressure on health, social, and economic systems. It impacts not only on those directly affected but also their caregivers. In the population, dementia subtypes are often mixed. In the oldest old, the relationship between the neuropathological hallmarks of dementia and cognitive impairment is often less clear; many individuals without dementia have at least some neuropathological markers of neurodegenerative disease. This chapter highlights the demographic changes of the ageing population and the social and economic impact of these changes. We specifically focus on dementia, covering its burden in terms of numbers, costs, and geographical distribution, highlighting the diagnostic and methodological issues related to the studies designed to verify its impact and subtypes in the population.

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