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# Dementia incidence 9.7 per 1000 person-years, higher in low- and middle-income countries
- URL: https://www.coios.me/dementia-incidence-9-7-per-1000-person-years-higher-in-low/
- Published: 2026-10-16T13:22:22.000Z
- Updated: 2026-10-17T08:14:41.000Z
- Description: Age- and sex-standardised all-cause dementia incidence was 9.7 per 1000 person-years across 22 cohorts in 18 countries.
- Author: Daniel Ryan
- Tags: Health today, Dementia, Revisions and new sources, World, #peer-reviewed, #refines, #item, #source-2026-10, #score-82

This meta-analysis pooled individual data from 22 longitudinal community-based cohorts, 38,418 people in 18 countries or territories. Over 287,632 person-years at risk, 3001 participants developed dementia, giving a standardised incidence of 9.7 per 1000\. Incidence was higher in women than men, 10.6 against 8.6 per 1000 person-years. It was higher in low- and middle-income countries, 13.6 against 8.3 in high-income countries. Applying the rates to the 2050 projected population gave 24.7 million new cases, assuming constant incidence. Baseline recruitment took place between 1990 and 2011, so the rates predate recent changes.

*Why it is interesting: It reports harmonised incidence rates rather than prevalence, separating new cases from survival. The excess in low- and middle-income countries and the constant-incidence projection both affect the global count.*

Source

[JAMA Neurology, 12 October 2026](https://doi.org/10.1001/jamaneurol.2026.3540?ref=coios.me)

Paper

Global Incidence of All-Cause Dementia

Authors

Vella AS, Visontay R, Lipnicki DM, Nichols E, Steinmetz JD, Vos T et al.

DOI

10.1001/jamaneurol.2026.3540

Type

Peer-reviewed article

Design

Two-step individual participant-data meta-analysis of 22 population-based longitudinal cohorts (COSMIC), n=38,418, 287,632 person-years, baselines 1990-2011 with follow-up to 2021, clinically diagnosed dementia

Verdict

Refines prior evidence

Driver

[Dementia](https://www.coios.me/d-dementia/)

Driver

[Revisions and new sources](https://www.coios.me/d-data-sources/)