Dementia and pneumonia linked to deaths in Down syndrome
A case-control analysis of 137,293 US adults with Down syndrome used 2011–2022 insurance records to identify conditions that helped predict death.
Our read
Populations- Studied:
- Preprint: case-control study of 137,293 people (11 years)
- In the record:
- The 2,469th paper on cardiovascular disease with results in people; 13,268 on record in all. Its result on mortality agrees with 49 of 51 other findings on record; 2 found no change.
Editor of record: Boris Djordjevic · AgingResearch.News
US adults aged 18 and older with Down syndrome—137,293 people enrolled in Medicaid, Medicare or both—were studied in a case-control analysis of insurance records from 2011–2022. During the study period, 30,894 (22.5%) died, at an average age of 55.
A machine-learning model ranked claims for dementia, a decline in thinking abilities, and pneumonia, a lung infection, among the strongest predictors of death. Claims for heart failure, when the heart cannot pump blood well enough, and epilepsy, a condition causing repeated seizures, also ranked highly. Repeated claims for cardiovascular disease, which affects the heart and blood vessels, three years before death or a comparison date were another leading predictor. Those cardiovascular claims were associated with lower predicted mortality in the model.
Why it matters
Alzheimer’s disease is a major contributor to deaths in people with Down syndrome, but some die without a diagnosis. The authors pointed to potentially addressable health risks as another focus for efforts to extend life.
Caveats
The analysis used insurance claims rather than confirmed causes of death and did not test whether treating these conditions reduced mortality. The preprint, which has not been peer-reviewed, covered Medicaid or Medicare enrollees and excluded people who died during their first year of claims.
The paper
Boston University
medRxiv, Jul 20, 2026, Open access, Preprint, not yet peer-reviewed
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