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TOPLINE:

Middle-aged or older adults with a prefrail or frail status had a significantly higher risk for incident dementia than those with a robust status. The risk for dementia rose sharply in participants whose status transitioned from robust to frail over 2 years.

METHODOLOGY:

• Researchers investigated whether the frailty status at baseline and its change over time were associated with the risk of developing dementia.
• They analyzed data of 25,357 middle-aged or older adults from three prospective cohorts based in China, the US, and the UK, with follow-up periods of about 9, 14, and 17 years, respectively.
• A frailty index was constructed using 28 health-related indicators, which classified participants as being robust, having prefrailty, or having frailty at baseline and approximately 2 years later.
• In a separate analysis, researchers stratified participants into tertiles of the total frailty index and tertiles of change in the frailty index over 2 years.
• The primary outcome was the risk for incident dementia, diagnosed using different validated measures of cognitive function in each cohort.

TAKEAWAY:

• Participants with prefrailty had a 13%-17% higher risk for dementia than those with a robust status (adjusted hazard ratio [aHR] range, 1.13-1.17 in two cohorts; P < .05 for both); those with frailty had an even higher risk (aHR range, 1.37-1.54 in all three cohorts; P < .01 for all).
• At 2 years, a shift from robust to frail status was associated with a marked increase in the risk for dementia (aHR range, 2.09-2.77 in two cohorts; P ≤ .001 for both); an increase in risk was also noted with a shift from prefrail to frail status (aHR, 1.32 in two cohorts; P < .05 for both).
• Participants in the upper and middle tertiles of the total frailty index and those in the upper tertile of change in the frailty index had significantly increased risks for dementia.

IN PRACTICE:

“[The study] findings highlight the importance of monitoring frailty trajectories and suggest that even modest declines in health reserve signal increased vulnerability to cognitive decline,” the authors of the study wrote.

“Assessing frailty progression in middle-aged and older adults serves a dual purpose: It acts as a ‘red flag’ for intensified cognitive screening and identifies a key modifiable target for preventative interventions,” they added.

SOURCE:

This study was led by Xin Ye, PhD, of the Institute for Global Public Policy at the Fudan University in Shanghai, China. It was published online on September 6, 2025, in the American Journal of Preventive Medicine.

LIMITATIONS:

Dementia was ascertained using different methods across the three cohorts, which may have affected the comparisons. This study could not exclude participants with conditions such as traumatic brain injury or delirium. The included participants were of advanced age, thus the findings may not be generalizable to all age groups or to regions with different healthcare systems.

DISCLOSURES:

This study received support from the National Natural Science Foundation of China and the “Chenguang Program” of the Shanghai Municipal Education Commission and Shanghai Education Development Foundation. The authors reported having no conflicts of interest.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.