Dementia burden is climbing across South and Southeast Asia

Design

Systematic review and meta-analysis of observational studies

Population

31 studies (13 pooled, N=56,340) from South and Southeast Asia

Primary outcome

Prevalence of dementia and Alzheimer's disease and associated factors

Effect

Dementia 3% (2–5%), Alzheimer's 2%; post-2010 Alzheimer's 8% vs 1% pre-2000; older age odds ratio 3.98

The fastest growth in dementia is projected in low- and middle-income countries, yet the evidence from South and Southeast Asia has been fragmented. This meta-analysis pooled 31 studies to estimate prevalence and risk factors for the region.

Overall dementia prevalence was about 3%, Alzheimer's disease 2%, with a striking time trend: estimated Alzheimer's prevalence rose to 8% in studies after 2010 from 1% before 2000. Older age raised the odds nearly fourfold, while higher literacy, adequate sleep, periodontal care and cognitive stimulation emerged as protective. Heterogeneity was very high, so the point estimates are soft.

For clinicians in these settings, including India, the usable message is twofold: expect a rising dementia caseload, and act on the modifiable protective factors — cognitive engagement, sleep, oral health and education-linked cognitive reserve — while building early screening into routine older-adult care rather than waiting for late, florid presentation.

• Pooled dementia prevalence was about 3% and Alzheimer's disease about 2% across South and Southeast Asia.
• Estimated Alzheimer's prevalence was 8% in post-2010 studies versus 1% before 2000.
• Older age raised Alzheimer's odds nearly fourfold (odds ratio 3.98); literacy, sleep, periodontal care and cognitive stimulation were protective.
• Build early dementia screening into routine older-adult care and act on modifiable protective factors.

Why it matters

It quantifies a fast-rising burden in exactly the settings least prepared for it, and names factors clinicians can act on.

Don't overread it

Observational prevalence data with extreme heterogeneity; the protective-factor associations are not proof that intervening on them prevents dementia.

The statistics, in plain English

Very high heterogeneity (I² near 99%) means the pooled prevalence figures are indicative, not precise. The sharp rise after 2010 partly reflects better ascertainment as much as true incidence, but the direction — a growing burden — is robust.

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