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Research

27,380 Alzheimer's and dementia studies in plain English, each scored out of 100.

Find studies

Showing 1–25 of 55 studies by Petersen RC · free to read (page 1 of 3) · 27,380 in the whole library · How the 0–100 score works

Browse by subject, author or institution

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

Subjects

Other authors

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

Institutions

From OpenAlex; 12,859 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.

Practice guideline update summary: Mild cognitive impairment [RETIRED]: Report of the Guideline Development, Dissemination, and Implementation Subcommittee of the American Academy of Neurology

✓ Peer-reviewed alzhub usefulness score 74 out of 100. Neurology 2017-12-27

MCI prevalence was 6.7% for ages 60-64, 8.4% for 65-69, 10.1% for 70-74, 14.8% for 75-79, and 25.2% for 80-84. 1 key finding →

Evidence: low

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

Quantitative Assessment of the Effect of Chronic Kidney Disease on Plasma P-Tau217 Concentrations

✓ Peer-reviewed alzhub usefulness score 69 out of 100. Neurology 2025-01-17

CKD was associated with increased p-tau217 concentrations when measuring p-tau217 by ALZpath and C 2 N methodologies, but the effect was mitigated by the use of %p-tau217. 5 key findings →

Design: cross-sectional Participants: 202 Evidence: moderate

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

Physical exercise as a preventive or disease-modifying treatment of dementia and brain aging

✓ Peer-reviewed alzhub usefulness score 69 out of 100. Mayo Clinic proceedings 2011-09-01

A rapidly growing literature strongly suggests that exercise, specifically aerobic exercise, may attenuate cognitive impairment and reduce dementia risk. 5 key findings →

Design: meta-analysis Evidence: high

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

Alzheimer's Disease Neuroimaging Initiative (ADNI): clinical characterization

✓ Peer-reviewed alzhub usefulness score 68 out of 100. Neurology 2009-12-30

The Alzheimer's Disease Neuroimaging Initiative has successfully recruited cohorts of cognitively normal subjects, subjects with mild cognitive impairment (MCI), and subjects with Alzheimer disease with anticipated baseline characteristics. 1 key finding →

Participants: 819 Evidence: low

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

Dysfunctionally phosphorylated type 1 insulin receptor substrate in neural-derived blood exosomes of preclinical Alzheimer's disease

✓ Peer-reviewed alzhub usefulness score 67 out of 100. FASEB journal : official publication of the Federation of American Societies for Experimental Biology 2014-10-23

Insulin resistance causes diminished glucose uptake in similar regions of the brain in Alzheimer's disease (AD) and type 2 diabetes mellitus (DM2). 4 key findings →

Design: longitudinal study Participants: 26 Evidence: moderate

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

Prevalence of neuropsychiatric symptoms in mild cognitive impairment and normal cognitive aging: population-based study

✓ Peer-reviewed alzhub usefulness score 67 out of 100. Archives of general psychiatry 2008-10-01

Multivariate logistic regression analyses were conducted after adjusting for age, sex, and educational status. 1 key finding →

Design: cohort study Participants: 1,969 Evidence: moderate

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

Association of Elevated Amyloid Levels With Cognition and Biomarkers in Cognitively Normal People From the Community

✓ Peer-reviewed alzhub usefulness score 67 out of 100. JAMA neurology 2016-01-01

In persons selected from a population-based study, elevated amyloid levels at baseline were associated with worse cognition and imaging biomarkers at baseline and with greater clinical decline and neurodegeneration. 5 key findings →

Design: longitudinal study Participants: 286 Evidence: high

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

Donepezil delays progression to AD in MCI subjects with depressive symptoms

✓ Peer-reviewed alzhub usefulness score 67 out of 100. Neurology 2009-06-01

Cox proportional hazards regression, adjusted for age at baseline, gender, apolipoprotein genotype, and NYU paragraph delayed recall score, showed that higher BDI scores were associated with progression to AD (p = 0.03). 4 key findings →

Participants: 208 Evidence: low

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

Mild cognitive impairment: a concept in evolution

✓ Peer-reviewed alzhub usefulness score 66 out of 100. Journal of internal medicine 2014-03-01

The construct of mild cognitive impairment (MCI) has evolved over the past 10 years since the publication of the new MCI definition at the Key Symposium in 2003, but the core criteria have remained unchanged. 1 key finding →

Design: longitudinal study Evidence: moderate

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

Prevalence of mild cognitive impairment is higher in men. The Mayo Clinic Study of Aging

✓ Peer-reviewed alzhub usefulness score 63 out of 100. Neurology 2010-09-01

Among 1,969 subjects without dementia, 329 subjects had MCI, with a prevalence of 16.0% (95% confidence interval [CI] 14.4-17.5) for any MCI, 11.1% (95% CI 9.8-12.3) for amnestic MCI, and 4.9% (95% CI 4.0-5.8) for nonamnestic MCI. 3 key findings →

Participants: 1,969 Evidence: low

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

Qualitative estimates of medial temporal atrophy as a predictor of progression from mild cognitive impairment to dementia

✓ Peer-reviewed alzhub usefulness score 63 out of 100. Archives of neurology 2007-01-01

Adjusted estimates of MTA were associated with significantly increased risk of developing dementia within 3 years, suggesting that obtaining a magnetic resonance image during the evaluation of MCI may offer additional independent information about the risk of progression to dementia. 2 key findings →

Participants: 190 Evidence: low

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

Longitudinal MRI findings from the vitamin E and donepezil treatment study for MCI

✓ Peer-reviewed alzhub usefulness score 63 out of 100. Neurobiology of aging 2007-04-23

The vitamin E and donepezil trial for the treatment of amnestic mild cognitive impairment (MCI) was conducted at 69 centers in North America; 24 centers participated in an MRI sub study. 2 key findings →

Participants: 131 Evidence: low

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

Altered lysosomal proteins in neural-derived plasma exosomes in preclinical Alzheimer disease

✓ Peer-reviewed alzhub usefulness score 62 out of 100. Neurology 2015-06-10

Levels of autolysosomal proteins in neurally derived blood exosomes distinguish patients with AD from case controls and appear to reflect the pathology of AD up to 10 years before clinical onset. 4 key findings →

Design: cross-sectional Participants: 26 Evidence: low

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

Identification of preclinical Alzheimer's disease by a profile of pathogenic proteins in neurally derived blood exosomes: A case-control study

✓ Peer-reviewed alzhub usefulness score 62 out of 100. Alzheimer's & dementia : the journal of the Alzheimer's Association 2014-08-15

Levels of P-S396-tau, P-T181-tau, and Aβ1-42 in extracts of neurally derived blood exosomes predict the development of AD up to 10 years before clinical onset. 2 key findings →

Participants: 57 Evidence: low

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

MRI and CSF biomarkers in normal, MCI, and AD subjects: predicting future clinical change

✓ Peer-reviewed alzhub usefulness score 61 out of 100. Neurology 2009-07-01

MRI and CSF provide complimentary predictive information about time to conversion from amnestic mild cognitive impairment to Alzheimer disease and combination of the 2 provides better prediction than either source alone. 3 key findings →

Participants: 399 Evidence: low

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

MRI and CSF biomarkers in normal, MCI, and AD subjects: diagnostic discrimination and cognitive correlations

✓ Peer-reviewed alzhub usefulness score 60 out of 100. Neurology 2009-07-01

We found no significant correlation between CSF biomarkers and cognitive scores in any of the 3 clinical groups individually. 2 key findings →

Design: cross-sectional Participants: 399 Evidence: low

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

Practice parameter: early detection of dementia: mild cognitive impairment (an evidence-based review) [RETIRED]. Report of the Quality Standards Subcommittee of the American Academy of Neurology

✓ Peer-reviewed alzhub usefulness score 60 out of 100. Neurology 2001-05-01

There were insufficient data to make any recommendations regarding cognitive screening of asymptomatic individuals. 4 key findings →

Evidence: low

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

Mild cognitive impairment due to Alzheimer disease in the community

✓ Peer-reviewed alzhub usefulness score 60 out of 100. Annals of neurology 2013-08-01

The NIA-AA criteria apply to most MCI subjects in both the community and clinical trials settings; however, a sizeable proportion of subjects had conflicting biomarkers, which may be very important and need to be explored. 2 key findings →

Design: longitudinal study Evidence: moderate

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

Amyloid deposition, hypometabolism, and longitudinal cognitive decline

✓ Peer-reviewed alzhub usefulness score 60 out of 100. Annals of neurology 2012-10-01

Using data from the Alzheimer's Disease Neuroimaging Initiative (ADNI) population, we examined (1) cross-sectional relationships between amyloid deposition, hypometabolism, and cognition, and (2) associations between amyloid and hypometabolism measurements and longitudinal cognitive measurements. 4 key findings →

Design: cross-sectional 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.

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 27,380 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 27,380 records, built mostly from automated pulls of Europe PMC (60.6% of the library) and OpenAlex (18.6%), 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.

1,032 records (3.8% of the library) are not peer-reviewed — 962 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