Cited by 142Dementia and Cognitive Impairment ResearchMental Health Treatment and AccessHealth disparities and outcomes

Trends in dementia diagnosis rates in UK ethnic groups: Analysis of UK primary care data

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Pham, Tra My, Petersen, Irene, Walters, Kate, Raine, Rosalind, Manthorpe, Jill, Mukadam, Naaheed, Cooper, Claudia·2018·Clinical Epidemiology

Abstract

OBJECTIVES: We compared incidence of dementia diagnosis by white, black, and Asian ethnic groups and estimated the proportion of UK white and black people developing dementia in 2015 who had a diagnosis for the first time in a UK-wide study. METHODS: We analyzed primary care electronic health records from The Health Improvement Network database between 2007 and 2015 and compared incidence of dementia diagnosis to dementia incidence from community cohort studies. The study sample comprised of 2,511,681 individuals aged 50-105 years who did not have a dementia diagnosis prior to the start of follow-up. RESULTS: A total of 66,083 individuals had a dementia diagnosis (4.87/1,000 person-years at risk, 95% CI 4.83-4.90); this incidence increased from 3.75 to 5.65/1,000 person-years at risk between 2007 and 2015. Compared with white women, the incidence of dementia diagnosis was 18% lower among Asian women (adjusted incidence rate ratio (IRR) 0.82, 95% CI 0.72-0.95) and 25% higher among black women (IRR 1.25, 95% CI 1.07-1.46). For men, incidence of dementia diagnosis was 28% higher in the black ethnic group (IRR 1.28, 95% CI 1.08-1.50) and 12% lower in the Asian ethnic group (IRR 0.88, 95% CI 0.76-1.01) relative to the white ethnic group. Based on diagnosis incidence in The Health Improvement Network data and projections of incidence from community cohort studies, we estimated that 42% of black men developing dementia in 2015 were diagnosed compared with 53% of white men. CONCLUSION: People from the black ethnic group had a higher incidence of dementia diagnosis and those from the Asian ethnic group had lower incidence compared with the white ethnic group. We estimated that black men developing dementia were less likely than white men to have a diagnosis of dementia, indicating that the increased risk of dementia diagnosis reported in the black ethnic group might underestimate the higher risk of dementia in this group. It is unclear whether the lower incidence of dementia diagnosis in the Asian ethnic group reflects lower community incidence or underdiagnosis. A cohort study to determine this is needed.

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  1. [2]Matthews FE Stephan BC Robinson L A two decade dementia incidence comparison from the Cognitive Function and Ageing Studies I and II Nat Commun 2016 7 11398 27092707 PMC4838896
  2. [31]StataCorp Stata multiple-imputation reference manual: release 14 2015 Available from: https://www.stata-press.com/data/r14/mimain.html Accessed May 30, 2018
  3. [34]Mehta KM Yeo GW Systematic review of dementia prevalence and incidence in United States race/ethnic populations Alzheimers Dement 2017 13 72 83 27599209

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Authors
Pham, T. M., Petersen, I., Walters, K., Raine, R., Manthorpe, J., Mukadam, N., & Cooper, C.
Affiliations
  • University College London (GB)
  • Aarhus University Hospital (DK)
  • King's College London (GB)
Corresponding author
Cooper, Claudia
Venue
Clinical Epidemiology
Published
2018-08
Volume
Volume 10
Pages
949-960
ISSN
1179-1349 (ISSN-L)
OpenAlex
W2887743981
Cited by
142
References
36
Citations by year
2026: 14 · 2025: 15 · 2024: 33 · 2023: 27 · 2022: 16 · 2021: 12 · 2020: 19 · 2019: 5
FWCI
7.08
Type
journal article
Language
en
Open access
Locations
  • Clinical Epidemiology (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Dove Medical Press (Taylor and Francis Group) (submittedVersion, cc-by-nc)
  • UCL Discovery (University College London) (submittedVersion)
  • Research Portal (King's College London) (submittedVersion, cc-by-nc)
Funders
  • National Institute for Health and Care Research (NF-SI-0616-10001)
  • Dunhill Medical Trust
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Social Sciences › Psychology › Social Psychology › Mental Health Treatment and Access
  • Social Sciences › Health › Health disparities and outcomes
Keywords
dementia, dementia incidence, ethnic disparities, Black ethnic groups, Asian ethnic groups, underdiagnosis, primary care, incidence trends, sex differences, Health Improvement Network, ethnic minority health, Black Africans, South Asians

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