27,380 Alzheimer's and dementia studies in plain English, each scored out of 100.
Among 34 349 participants, 19 378 individuals who were free of stroke and dementia and had longitudinal BP, cognitive, and covariate data were included in the analysis. 2 key findings →
Design: longitudinal study Participants: 349 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
A total of 2320 unique papers was found; the full text of 87 was reviewed. 1 key finding →
Design: systematic review Participants: 10,500 Evidence: high
Full summary, score breakdown and related studies → Original source Free full text
Accumulating data suggest that cerebrovascular disease contributes to Alzheimer's disease pathophysiology and progression toward dementia. 5 key findings →
Design: cohort study Participants: 1,722 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Of the 7342 total sample, 4348 participants (60.3%) were women. 5 key findings →
Design: cohort study Participants: 7,342 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
In this exploratory analysis of a US community-based cohort, several echocardiographic measures of lower LA function were significantly associated with an increased risk of subsequent dementia. 5 key findings →
Design: prospective cohort Participants: 4,096 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Head injury was associated with risk of dementia (hazard ratio [HR] = 1.44, 95% confidence interval [CI] = 1.3-1.57), with evidence of dose-response (1 head injury: HR = 1.25, 95% CI = 1.13-1.39, 2+ head injuries: HR = 2.14, 95% CI = 1.86-2.46). 3 key findings →
Design: cohort study Participants: 14,376 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Among 13,875 individuals with nonmissing VRF and outcome data with up to 30 years of follow-up (25% Black, 54% female), 179 developed PD at a mean age of 73.4 years, 94 developed PDD at a mean age of 79.2 years, and 1,791 developed dementia without PD at a mean age of 79.7 years. 5 key findings →
Design: longitudinal study Participants: 13,875 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Greater purpose in life is associated with a reduced risk of all-cause mortality among community-dwelling older persons. 4 key findings →
Design: cohort study Participants: 1,238 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Among well-functioning older adults, DM and poor glucose control among those with DM are associated with worse cognitive function and greater decline. 5 key findings →
Design: cohort study Participants: 717 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
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. 5 key findings →
Design: cohort study Participants: 2,511,681 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
A large proportion of the Medicare PD population resides in an LTCF. 2 key findings →
Design: cohort study Participants: 38,334 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Our findings suggest that decreasing disparities between sexes in education, due to secular increases in educational opportunities, could attenuate sex differences in dementia risk and cognitive decline in the future. 1 key finding →
Design: cohort study Participants: 924 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
This review highlights that air pollutions, especially PM 2.5 and NO 2 play important role in the risk for age-related cognitive impairment and dementia. 3 key findings →
Design: systematic review Evidence: high
Full summary, score breakdown and related studies → Original source Full text may need a subscription
Evidence to date suggest there are ethnic differences in risk of dementia. 2 key findings →
Design: meta-analysis Participants: 12 Evidence: high
Full summary, score breakdown and related studies → Original source Free full text
Included in the analysis were 48,330 participants across 46 ADRCs (mean [SD] age, 71.3 [10.5] years; 20,767 female [57%]; 4,138 Hispanic [8.6%]; 1,392 non-Hispanic Asian [2.9%]; 6,766 non-Hispanic Black [14%] individuals; and 676 individuals [1.4%] of other races. 4 key findings →
Design: cross-sectional Participants: 48,330 Evidence: low
Full summary, score breakdown and related studies → Original source
Social determinants of health, including neighborhood factors, play a key role in the health of diverse older adults. 3 key findings →
Design: longitudinal study Participants: 452 Evidence: moderate
Full summary, score breakdown and related studies → Original source
The final sample comprised 2478 individuals, of which 59 (2.4%) were Asian, 63 (2.5%) were Black, and 2356 (95.1%) were White. 5 key findings →
Design: cross-sectional Participants: 2,478 Evidence: low
Full summary, score breakdown and related studies → Original source
Two models comprising behavior change and psychological impact fit well for the total sample and the two racial groups. 5 key findings →
Design: longitudinal study Participants: 334 Evidence: moderate
Full summary, score breakdown and related studies → Original source
Among the cohort of 7180 older adults (median age, 74 years [range, 65-102 years]; 4729 women [65.9%]), 1036 were African American or Black (14.4%), 21 were American Indian or Alaska Native (0.3%), 143 were Asian (2.0%), 332 were Hispanic (4.6%), and 5648 were non-Hispanic White (78.7%); the median educational level was 16.0 years (range, 1.0-29.0 years). 5 key findings →
Design: cohort study Evidence: moderate
Full summary, score breakdown and related studies → Original source
ϵ4 prevalence in Black (46%) and White participants (46%) was almost double that of Latino participants (24%). ϵ4 was associated with poorer baseline episodic memory only in White participants (p = .001), but had a moderately strong association with episodic memory change across all racial/ethnic groups (Blacks= -.061 SD/year, Latinos = -.055,Whites= -.055). ϵ4 association with semantic memory change was strongest in White participants (-.071), intermediate in Latino participants (-.041), and weakest in Black participants (-.022). 4 key findings →
Design: longitudinal study Participants: 297 Evidence: moderate
Full summary, score breakdown and related studies → Original source
These findings support the hypothesis that the metabolic syndrome contributes to cognitive impairment in elders, but primarily in those with high level of inflammation. 5 key findings →
Participants: 1,616 Evidence: low
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Psychotic symptoms are common and persistent in patients with Alzheimer's disease. 5 key findings →
Design: longitudinal study Participants: 9,749 Evidence: moderate
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Professional caregivers may initiate ACP early if strategies carefully consider timing and family and patient receptiveness or reluctance, and are family and patient-centered. 2 key findings →
Design: systematic review Participants: 33 Evidence: high
Full summary, score breakdown and related studies → Original source Free full text
Older adults with diabetes and dementia are at increased risk for hypoglycemia and other adverse events associated with tight glycemic control and are unlikely to experience long-term benefits. 4 key findings →
Design: cohort study Participants: 15,880 Evidence: moderate
Full summary, score breakdown and related studies → Original source Free full text
Rural subjects with higher health literacy were more likely to want comfort care compared to those with lower levels of health literacy. 5 key findings →
Design: randomized controlled trial Participants: 43 Evidence: high
Full summary, score breakdown and related studies → Original source Full text may need a subscription
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 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.
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 →