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Research

31,380 Alzheimer's and dementia studies in plain English, each scored out of 100.

Find studies

Showing 1–25 of 50 studies with an author at University of Southern California (US) (page 1 of 2) · 31,380 in the whole library · How the 0–100 score works

Download bibliography of these 50 studies, in this order: BibTeX (.bib) · RIS (.ris)

Showing 50 studies tagged prevalence — clear

Browse by subject, author or institution

Each number is how many studies that link shows, with your other filters kept.

Subjects

Authors

Names as each record prints them; the same person can appear under two spellings.

Other institutions

From OpenAlex; 16,851 studies have no institution on record and are not counted here.

A note on reading research. One study is rarely the final word.

We try to note the size of a study, whether it was in humans or animals, and how early-stage the finding is. If a summary here doesn't make that clear, treat it with extra caution and check the original source.

A Comparison of the Prevalence of Dementia in the United States in 2000 and 2012

✓ Peer-reviewed alzhub usefulness score 71 out of 100. JAMA internal medicine 2017-01-01

The study cohorts had an average age of 75.0 years (95% CI, 74.8-75.2 years) in 2000 and 74.8 years (95% CI, 74.5-75.1 years) in 2012 (P = .24); 58.4% (95% CI, 57.3%-59.4%) of the 2000 cohort was female compared with 56.3% (95% CI, 55.5%-57.0%) of the 2012 cohort (P Conclusions and relevance The prevalence of dementia in the United States declined significantly between 2000 and 2012. 4 key findings →

Design: longitudinal study Evidence: moderate

Full summary, score breakdown and related studies → Original source Free full text

Medicare's Annual Wellness Visit and diagnoses of dementias and cognitive impairment

✓ Peer-reviewed alzhub usefulness score 58 out of 100. Alzheimer s & Dementia Diagnosis Assessment & Disease Monitoring 2022-01-01

Beneficiaries included 2,713,573 White, 251,958 Black, 196,845 Hispanic, 95,719 Asian, 11,727 American Indian/Alaska Native, and 63,795 of other race/ethnicity. 5 key findings →

Design: retrospective cohort Participants: 3,333,617 Evidence: moderate

Full summary, score breakdown and related studies → Original source Free full text

Analysis of dementia in the US population using Medicare claims: Insights from linked survey and administrative claims data

✓ Peer-reviewed alzhub usefulness score 57 out of 100. Alzheimer's & dementia (New York, N. Y.) 2019-06-06

Survey-based cognitive tests and claims-based dementia diagnosis yielded equal prevalence estimates, yet only half were identified by both measures. 4 key findings →

Participants: 10,450 Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

The 2022 symposium on dementia and brain aging in low- and middle-income countries: Highlights on research, diagnosis, care, and impact

✓ Peer-reviewed alzhub usefulness score 57 out of 100. Alzheimer's & dementia : the journal of the Alzheimer's Association 2024-05-02

Two of every three persons living with dementia reside in low- and middle-income countries (LMICs). 5 key findings →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Preventing dementia by preventing stroke: The Berlin Manifesto

✓ Peer-reviewed alzhub usefulness score 56 out of 100. Alzheimer's & dementia : the journal of the Alzheimer's Association 2019-07-01

The incidence of stroke and dementia are diverging across the world, rising for those in low- and middle-income countries and falling in those in high-income countries. 3 key findings →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Dementia diagnosis and utilization patterns in a racially diverse population within an integrated health care delivery system

✓ Peer-reviewed alzhub usefulness score 55 out of 100. Alzheimer s & Dementia Translational Research & Clinical Interventions 2022-01-01

ADRD prevalence was 5.5%. A total of 25,278 individuals had an incident ADRD code (rate: 1.2%) over the study period-nearly half during a hospital-based encounter. 5 key findings →

Participants: 25,278 Evidence: moderate

Full summary, score breakdown and related studies → Original source Free full text

Voiceprints of cognitive impairment: analyzing digital voice for early detection of Alzheimer’s and related dementias

✓ Peer-reviewed alzhub usefulness score 55 out of 100. npj Dementia 2025-11-03

Early detection of Alzheimer's disease (AD) is critical yet challenging, particularly in younger individuals. 1 key finding →

Design: longitudinal study Participants: 120 Evidence: moderate

Full summary, score breakdown and related studies → Original source Free full text

State Department of Motor Vehicles Reporting Mandates of Dementia Diagnoses and Dementia Underdiagnosis

✓ Peer-reviewed alzhub usefulness score 54 out of 100. JAMA Network Open 2024-04-25

Four states have clinician reporting mandates, 14 have mandates requiring drivers to self-report dementia diagnoses, and 32 states and the District of Columbia do not have explicit requirements. 5 key findings →

Design: cross-sectional Participants: 35 Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Global rural health disparities in Alzheimer's disease and related dementias: State of the science

✓ Peer-reviewed alzhub usefulness score 53 out of 100. Alzheimer's & dementia : the journal of the Alzheimer's Association 2023-05-23

A location dynamics model and ADRD-focused future directions are offered for guiding rural practitioners, researchers, and policymakers in mitigating rural disparities. 1 key finding →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Addressing the disparities in dementia risk, early detection and care in Latino populations: Highlights from the second Latinos & Alzheimer's Symposium

✓ Peer-reviewed alzhub usefulness score 53 out of 100. Alzheimer's & dementia : the journal of the Alzheimer's Association 2022-02-24

The Alzheimer's Association hosted the second Latinos & Alzheimer's Symposium in May 2021. 2 key findings →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Differences Between Women and Men in Incidence Rates of Dementia and Alzheimer's Disease

✓ Peer-reviewed alzhub usefulness score 53 out of 100. Journal of Alzheimer's disease : JAD 2018-01-01

In the following brief report, we examined gender differences in incidence rates of any dementia, Alzheimer's disease (AD) alone, and non-Alzheimer's dementia alone in 16,926 women and men in the Swedish Twin Registry aged 65+. 2 key findings →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Racial and ethnic differences in trends in dementia prevalence and risk factors in the United States

✓ Peer-reviewed alzhub usefulness score 51 out of 100. Alzheimer's & dementia (New York, N. Y.) 2018-10-05

Racial disparities in dementia may be reduced by prevention and management of disease and promoting educational attainment among blacks and Hispanics. 3 key findings →

Evidence: low

Full summary, score breakdown and related studies → Original source Free full text

Trends in Incident Dementia Diagnosis Before and After Medicare Risk Adjustment

✓ Peer-reviewed alzhub usefulness score 50 out of 100. JAMA Network Open 2023-12-15

This cohort study examines rates of new diagnosis of Alzheimer disease and related dementias among beneficiaries of Medicare Advantage plans vs traditional Medicare from 2016 through 2020. 1 key finding →

Design: cohort study Evidence: moderate

Full summary, score breakdown and related studies → Original source Free full text

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Where “Free full text” comes from

Free full text links and the Full text may need a subscription label come from Unpaywall, Europe PMC and OpenAlex records of free copies, checked 10 Oct 2026. A study with neither is unknown, not paywalled. Show only studies that are free to read

How the 0–100 score works — and why some entries are capped

This is alzhub's own score. It is not an official metric, not an impact factor, and no journal, publisher or ranking body endorses it. We built it so that a reader who is not a scientist can tell a landmark trial from a conference abstract without having to already know the difference. Every point comes from one of 20 components, all of them printed on the study itself, so you can disagree with our arithmetic rather than having to trust the total.

  • Journal tier up to 10 pts
  • Journal's citation record up to 4 pts
  • Study design up to 12 pts
  • Strength of evidence up to 5 pts
  • Peer-review validation up to 10 pts
  • How recent up to 5 pts
  • Sample size up to 4 pts
  • Effect reported up to 3 pts
  • Studied in people up to 3 pts
  • Randomised / blinded up to 2 pts
  • Times cited up to 7 pts
  • Citations per year up to 5 pts
  • Impact for its field and year up to 6 pts
  • Cited by studies here up to 6 pts
  • Still being cited up to 4 pts
  • Senior author's track record up to 4 pts
  • Institution's track record up to 3 pts
  • Multi-centre collaboration up to 3 pts
  • Indexed in PubMed up to 2 pts
  • Free to read up to 2 pts

Journals are placed in ordered tiers, never given a numeric impact factor — we could not verify current impact factors from a source we control, and an invented one would be worse than none. Tier 1 is the top-tier general journals (NEJM, The Lancet, JAMA, Nature, Science, Nature Medicine); tier 2 is the leading specialty journals; tier 3 is every other peer-reviewed journal. A separate part scores how much the journal's own papers are cited, which tells the tier-3 journals apart.

Two rules we don't bend. First, we never fill in a missing value: if a record does not state a sample size or a design, that component scores zero, and if we simply have no data for a part, such as a citation count, that part is left out and the study is scored on the parts we could check. The study card says which. Second, anything that is not a peer-reviewed article is capped at 16/100 and carries a warning chip — so a conference abstract or a company press release can never outrank a peer-reviewed paper, no matter how good it looks.

We rank a rigorous null result — a good trial showing that something does not work — above an early positive finding. Someone deciding whether to buy a supplement is served by that, and the rigour is already counted by the design and journal components.

The score is computed from the published data alone and is reproducible: the same file always yields the same numbers.

See the whole rubric drawn out → — four charts covering all 31,380 studies: how the scores are spread and where the cap bites, which of the 20 components the library is strong and weak on, which subjects rest on stronger evidence, and what kinds of study each subject is actually built from.

What this library is — and isn't

This is a large sample of the Alzheimer's literature, not an exhaustive index of it. It holds 31,380 records, built mostly from automated pulls of Europe PMC (65.6% of the library) and OpenAlex (16.2%), plus smaller pulls from PubMed, Crossref and medRxiv. If a study, a drug, or a finding isn't here, that is not evidence it doesn't exist in the literature — it may simply not have been pulled in yet.

1,048 records (3.3% of the library) are not peer-reviewed — 973 of those are preprints posted before any journal review, and the rest are conference abstracts, regulatory notices and reports. Every study card on this page states its status plainly, and the score above is capped for anything that isn't a peer-reviewed article.

See the full, machine-readable breakdown of this library's coverage →

Newest studies, as a dated timeline →    Atom feed    Where this research is being discussed: events