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Researchers led by Northumbria University developed and validated a five-factor score to estimate three-year dementia risk in older adults in low- and middle-income countries. It uses information gathered through conversation and is intended to support research recruitment, not routine population screening; further validation is needed in regions not included in the study.
An international team led by Northumbria University has developed and tested a conversational score using five everyday factors to estimate dementia risk among older adults in low- and middle-income countries. Published in the American Journal of Epidemiology, the model was evaluated using data from more than 11,000 people across seven countries and is intended chiefly to help researchers identify participants for studies and trials, not to serve as a general-population screening test.
The score draws on age, social engagement, physical activity, high blood pressure and difficulty managing money. Researchers say the information can be gathered through a straightforward conversation with an older person and, where relevant, a family member or carer, without blood tests, brain scans or specialist equipment. Each factor contributes points to a total from 0 to 9.
The report says a person with a score of 0 has about a 1% chance of developing dementia within three years, while a score of 9 corresponds to a nearly 19% chance. The model achieved an accuracy score of 0.75; the researchers say 0.70 is generally regarded as a threshold for clinical usefulness. These estimates describe the model’s reported performance and do not establish what will happen to any individual.
The team tested the model across sites in China, Cuba, the Dominican Republic, Puerto Rico, Venezuela, Mexico and Peru. The study was funded by the UK National Institute for Health and Care Research using UK Government international development funding, with additional support from Dementia Australia.
A Research Tool for Wider Access
The study addresses a gap in dementia research: prediction tools developed using data from high-income countries may not perform as well in different populations and settings. The report estimates that about 60% of people living with dementia are in low- and middle-income countries, where access to specialist testing and equipment may be limited. A method based on ordinary questions could make it easier for research teams to identify and recruit older adults at higher estimated risk.
That potential is distinct from clinical diagnosis. The score estimates risk over a defined period; it does not determine whether someone has dementia, and the study presents it as a way to support research and trials. Its practical value will depend on whether it performs reliably in additional communities and can be used alongside appropriate local health services.
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Why Existing Risk Models May Not Transfer
Dementia affects more than 57 million people worldwide, according to the source report. It says many existing prediction models were developed from information gathered in high-income countries and have transferred poorly to other settings, leaving researchers with fewer tools suited to low- and middle-income populations.
The five factors were selected to be assessable without specialist equipment. Age was identified as the strongest single predictor, with risk rising from age 70 and more steeply from 80. Social engagement includes living arrangements and contact with family, friends and community or religious groups. Physical activity covers daily movement, including work, walking and household tasks. The score also includes high blood pressure and a reported change in managing finances, which may be noticed by a family member or carer.
Professor Dame Louise Robinson of Newcastle University, who led the NIHR-funded programme behind the research, credited colleagues in the 10/66 Dementia Research Group network with making the work possible. The study’s seven-country coverage spans Latin America and the Caribbean, as well as China, but does not represent every region where the tool could be used.
“This model is a step towards changing that.”
— Dr. Eduwin Pakpahan, Northumbria University’s Applied Statistics and Data Science Research Group
Where the Score Still Needs Testing
The study does not establish how accurately the score will work in regions not represented in the data, including South Asia, the Middle East and North Africa, and Sub-Saharan Africa. The researchers are calling for validation in those areas. Results from seven sites cannot by themselves show that the same risk estimates will apply across all countries, communities or health systems.
The source report does not provide further detail here about how the model’s accuracy varied between sites or demographic groups, or how it would perform when used in routine health care. Nor does the reported accuracy score mean that every person will receive a correct risk estimate. The researchers’ stated purpose is to support research recruitment, rather than recommend general screening.
Further Regional Validation Ahead
The researchers say the next step is to test the model in additional regions and diverse populations, particularly those not covered in this study. Those results would help clarify whether the score’s performance holds beyond the seven sites and whether local adaptation is needed.
For now, the tool is positioned as a practical option for researchers planning studies and clinical trials in settings with limited access to specialist testing. The report does not announce a timetable for further validation or a plan to introduce the score as a routine clinical screening tool.
Key Questions
What does the conversational score estimate?
It estimates a person’s risk of developing dementia within three years, based on five factors. It is not a diagnosis of dementia.
What information does it use?
The score considers age, social engagement, physical activity, high blood pressure and difficulty managing money. Researchers say these factors can be assessed through conversation, sometimes with input from a family member or carer.
How well did the model perform in the study?
The report gives an accuracy score of 0.75 from testing across seven countries. The researchers describe 0.70 as a threshold generally regarded as clinically useful, but the score does not guarantee an accurate estimate for every individual.
Is this intended as a routine dementia screening test?
No. The researchers say its primary purpose is to help research studies and clinical trials identify and recruit people at higher risk, rather than screen the general population.
Where does the model still need validation?
The researchers have called for testing in regions not included in the study, especially South Asia, the Middle East and North Africa, and Sub-Saharan Africa.
Source: news-medical.net
