Dementia Risk May Follow a Geographic Pattern
TOPLINE:
Dementia incidence varied significantly by US region in a new study, with the Southeast showing a 25% higher risk and the Northwest and Rocky Mountains each showing a 23% higher risk compared to the Mid-Atlantic. Investigators said the findings highlight the need for a geographically tailored approach to address dementia risk factors and diagnostic services.
METHODOLOGY:
Researchers conducted a cohort study using data from the US Veterans Health Administration for more than 1.2 million older adults without dementia (mean age, 73.9 years; 98%% men) from 1999 to 2021. The average follow-up was 12.6 years.
Ten geographical regions across the US were defined using the CDC National Center for Chronic Disease Prevention and Health Promotion definition.
The diagnosis of dementia was made using International Classification of Diseases, Ninth and Tenth Revision codes from inpatient and outpatient visits.
TAKEAWAY:
Dementia incidence rates per 1000 person-years were lowest in the Mid-Atlantic (11.2; 95% CI, 11.1-11.4) and highest in the Southeast (14.0; 95% CI, 13.8-14.2).
After adjusting for demographics, compared with the Mid-Atlantic region, dementia incidence was highest in the Southeast (rate ratio [RR], 1.25), followed by the Northwest and Rocky Mountains (RR for both, 1.23), South (RR, 1.18), Southwest (RR, 1.13), and Midwest and South Atlantic (RR for both, 1.12). The Great Lakes and Northeast regions had < a 10% difference in incidence.
Results remained consistent after adjusting for rurality and cardiovascular comorbidities, and after accounting for competing risk for death.
IN PRACTICE:
'This study provides valuable insights into the regional variation in dementia incidence among US veterans in that we observed more than 20% greater incidence in several regions compared with the Mid-Atlantic region,' the investigators wrote.
'By identifying areas with the highest incidence rates, resources can be better allocated and targeted interventions designed to mitigate the impact of dementia on vulnerable populations,' they added.
SOURCE:
This study was led by Christina S. Dintica, PhD, University of California, San Francisco. It was published online on June 9 in JAMA Neurology.
LIMITATIONS:
This study population was limited to US veterans, limiting the generalizability of the findings. Education level was defined using educational attainment rates in the participants' zip codes rather than individual data. Additionally, because residential history was limited to a single location per participant, migration patterns could not be tracked.
DISCLOSURES:
This study was supported by grants from the Alzheimer's Association, the National Institute on Aging, and the Department of Defense. One author reported serving on data and safety monitoring boards for studies sponsored by the National Institutes of Health, as well as holding advisory board membership and receiving personal fees from industry. Full details are listed in the original article. The other four investigators reported no relevant financial conflicts.
This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.
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