Declining incidence of dementia:  A national registry-based study over 20 years

Lærke Taudorf; Ane Nørgaard; Sabrina Islamoska; Kasper Jørgensen; Thomas Munk Larsen; Gunhild Waldemar

doi:10.1016/j.jalz.2019.07.006

Declining incidence of dementia: A national registry-based study over 20 years

Lærke Taudorf^*, Ane Nørgaard, Sabrina Islamoska, Kasper Jørgensen, Thomas Munk Larsen, Gunhild Waldemar

^*Corresponding author for this work

Section of Social Medicine

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Abstract

Introduction
The aim of this study was to investigate the registry-based national time trends in incidence and prevalence rates of dementia from 1996 to 2015.

Methods
We assessed annual incidence and prevalence using longitudinal data from nationwide registries on dementia status and demographics on all residents ≥ 65 years old in Denmark.

Results
Our population comprised 2 million people, of whom 152,761 were diagnosed with dementia. The age- and sex-adjusted incidence rate increased, on average, by 9% annually from 1996 to 2003, followed by a 2% annual decline, while total prevalence increased during the whole period.

Discussion
This is the first study to report continuous time trends of incidence and prevalence in an entire national population. The incidence rate has declined steadily since 2003, while the total prevalence is still increasing. Future health care planning on prevention and treatment of dementia should take these findings into account.

Original language	English
Journal	Alzheimer's and Dementia
Volume	15
Issue number	11
Pages (from-to)	1383-1391
Number of pages	9
ISSN	1552-5260
DOIs	https://doi.org/10.1016/j.jalz.2019.07.006
Publication status	Published - Nov 2019

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Cite this

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title = "Declining incidence of dementia: A national registry-based study over 20 years",

abstract = "IntroductionThe aim of this study was to investigate the registry-based national time trends in incidence and prevalence rates of dementia from 1996 to 2015.MethodsWe assessed annual incidence and prevalence using longitudinal data from nationwide registries on dementia status and demographics on all residents ≥ 65 years old in Denmark.ResultsOur population comprised 2 million people, of whom 152,761 were diagnosed with dementia. The age- and sex-adjusted incidence rate increased, on average, by 9% annually from 1996 to 2003, followed by a 2% annual decline, while total prevalence increased during the whole period.DiscussionThis is the first study to report continuous time trends of incidence and prevalence in an entire national population. The incidence rate has declined steadily since 2003, while the total prevalence is still increasing. Future health care planning on prevention and treatment of dementia should take these findings into account.",

author = "L{\ae}rke Taudorf and Ane N{\o}rgaard and Sabrina Islamoska and Kasper J{\o}rgensen and Larsen, {Thomas Munk} and Gunhild Waldemar",

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doi = "10.1016/j.jalz.2019.07.006",

language = "English",

volume = "15",

pages = "1383--1391",

journal = "Alzheimer's & Dementia",

issn = "1552-5260",

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TY - JOUR

T1 - Declining incidence of dementia

T2 - A national registry-based study over 20 years

AU - Taudorf, Lærke

AU - Nørgaard, Ane

AU - Islamoska, Sabrina

AU - Jørgensen, Kasper

AU - Larsen, Thomas Munk

AU - Waldemar, Gunhild

PY - 2019/11

Y1 - 2019/11

N2 - IntroductionThe aim of this study was to investigate the registry-based national time trends in incidence and prevalence rates of dementia from 1996 to 2015.MethodsWe assessed annual incidence and prevalence using longitudinal data from nationwide registries on dementia status and demographics on all residents ≥ 65 years old in Denmark.ResultsOur population comprised 2 million people, of whom 152,761 were diagnosed with dementia. The age- and sex-adjusted incidence rate increased, on average, by 9% annually from 1996 to 2003, followed by a 2% annual decline, while total prevalence increased during the whole period.DiscussionThis is the first study to report continuous time trends of incidence and prevalence in an entire national population. The incidence rate has declined steadily since 2003, while the total prevalence is still increasing. Future health care planning on prevention and treatment of dementia should take these findings into account.

AB - IntroductionThe aim of this study was to investigate the registry-based national time trends in incidence and prevalence rates of dementia from 1996 to 2015.MethodsWe assessed annual incidence and prevalence using longitudinal data from nationwide registries on dementia status and demographics on all residents ≥ 65 years old in Denmark.ResultsOur population comprised 2 million people, of whom 152,761 were diagnosed with dementia. The age- and sex-adjusted incidence rate increased, on average, by 9% annually from 1996 to 2003, followed by a 2% annual decline, while total prevalence increased during the whole period.DiscussionThis is the first study to report continuous time trends of incidence and prevalence in an entire national population. The incidence rate has declined steadily since 2003, while the total prevalence is still increasing. Future health care planning on prevention and treatment of dementia should take these findings into account.

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DO - 10.1016/j.jalz.2019.07.006

M3 - Journal article

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SN - 1552-5260

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JO - Alzheimer's & Dementia

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