30,180 Alzheimer's and dementia studies in plain English, each scored out of 100.
The incidence rate of dementia in Europe and North America has declined by 13% per decade over the past 25 years, consistently across studies. 2 key findings →
Design: cohort study Participants: 49,202 Evidence: moderate
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Over a long period of observation, no evidence was found that a specific AHM drug class was more effective than others in lowering risk of dementia. 4 key findings →
Design: meta-analysis Participants: 31 Evidence: high
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Midlife and late-life risk factors contributed to 22.7% and 16.5% of total dementia cases, respectively. 5 key findings →
Design: meta-analysis Participants: 37,931 Evidence: high
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We conducted a meta-analysis of the conflicting epidemiologic evidence on the association between midlife body mass index (BMI) and dementia. 4 key findings →
Design: meta-analysis Participants: 19 Evidence: high
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In the 1990 subcohort (25,696 person-years), 286 persons developed dementia, and in the 2000 subcohort (8,384 person-years), 49 persons. 4 key findings →
Design: cohort study Participants: 5,727 Evidence: moderate
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High concentrations of Abeta(1-40) but not Abeta(1-42) at baseline were associated with an increased risk of dementia. 5 key findings →
Design: cohort study Participants: 6,713 Evidence: moderate
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During mean follow-up of 2.1 (range 1.5-3.4) years, 146 incident cases of dementia were detected, of which 105 were Alzheimer's disease. 3 key findings →
Design: case-control study Participants: 6,870 Evidence: moderate
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Cerebral hypoperfusion has previously been associated with mild cognitive impairment and dementia in various cross-sectional studies, but whether hypoperfusion precedes neurodegeneration is unknown. 4 key findings →
Design: cross-sectional Participants: 4,759 Evidence: low
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We re-assessed after longer follow-up time in the large population-based cohort of the Rotterdam Study whether smoking habits and pack-years of smoking are associated with the risk of dementia, Alzheimer disease (AD), and vascular dementia (VaD). 4 key findings →
Design: cohort study Participants: 6,868 Evidence: moderate
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Whether this results in an increased risk for dementia remains unclear. 4 key findings →
Design: prospective cohort Participants: 3,975 Evidence: moderate
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Low bone mineral density (BMD) and dementia commonly co-occur in older individuals, with bone loss accelerating in patients with dementia due to physical inactivity and poor nutrition. 4 key findings →
Design: cohort study Participants: 3,651 Evidence: moderate
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Retinal structures may serve as a biomarker for dementia, but longitudinal studies examining this link are lacking. 4 key findings →
Design: longitudinal study Participants: 5,065 Evidence: moderate
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Female participants had a lower hazard of early-onset dementia compared with males (HR 0·70 [95% CI 0·61-0·80]). 4 key findings →
Design: cohort Participants: 544,442 Evidence: high
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High intake of total, saturated, and trans fat and cholesterol and low intake of MUFA, PUFA, n-6 PUFA, and n-3 PUFA were not associated with increased risk of dementia or its subtypes. 4 key findings →
Design: cohort study Participants: 5,395 Evidence: moderate
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Atrial fibrillation (AF) has been suggested as a risk factor for dementia since it may lead to chronic cerebral hypoperfusion and stroke. 4 key findings →
Design: longitudinal study Participants: 6,514 Evidence: moderate
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To assess age-, sex-, and subtype-specific incidence rates of dementia and to calculate the risk of dementia, the authors performed a large, community-based, prospective cohort study on dementia as part of the Rotterdam Study. 4 key findings →
Design: cohort study Participants: 7,046 Evidence: moderate
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Atherosclerosis has been implicated in the development of dementia and its major subtypes, Alzheimer's disease and vascular dementia. 4 key findings →
Design: cohort study Participants: 6,647 Evidence: moderate
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The Rotterdam Study previously found that higher dietary intakes of vitamins E and C related to lower risk of dementia and Alzheimer disease (AD) over 6 years of follow-up. 4 key findings →
Design: cohort study Participants: 5,395 Evidence: moderate
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Vascular and inflammatory factors may play an important role in the pathogenesis of dementia. 4 key findings →
Participants: 2,835 Evidence: moderate
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Advanced glycation end products (AGEs) and their receptor (RAGE) are implicated in the pathophysiological processes of dementia and potentially underlie the association of diabetes with neurodegeneration. 4 key findings →
Design: cohort study Participants: 1,021 Evidence: moderate
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Overall, cumulative incidence was uniformly higher in NACC than in the population-based cohorts. 3 key findings →
Participants: 5,073 Evidence: moderate
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The exact etiology of dementia is still unclear, but both genetic and lifestyle factors are thought to be key drivers of this complex disease. 1 key finding →
Participants: 6,352 Evidence: low
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White matter lesions, especially in the periventricular region, increase the risk of dementia in elderly people. 2 key findings →
Design: cohort study Participants: 1,077 Evidence: moderate
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The prevalence of dementia increases exponentially with age. 1 key finding →
Participants: 7,528 Evidence: low
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The association between blood pressure and dementia is debated. 4 key findings →
Design: longitudinal study Participants: 6,668 Evidence: moderate
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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
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.
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 30,180 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.
This is a large sample of the Alzheimer's literature, not an exhaustive index of it. It holds 30,180 records, built mostly from automated pulls of Europe PMC (64.2% of the library) and OpenAlex (16.9%), 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.
1,037 records (3.4% of the library) are not peer-reviewed — 964 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 →