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The disability process: is there a place for frailty?

Alfonso Zamudio-Rodríguez1, Luc Letenneur1, Catherine Féart1

  • 1University of Bordeaux, Inserm, Bordeaux Population Health Research Center, UMR 1219, Bordeaux, France.

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Frailty in older adults may precede disability, suggesting it

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Area of Science:

  • Gerontology
  • Public Health
  • Epidemiology

Background:

  • Frailty and disability are common in older adults, sharing risk factors and mechanisms but representing distinct clinical entities.
  • Understanding their relationship is crucial for geriatric care and public health strategies.

Purpose of the Study:

  • To investigate a potential hierarchical relationship between frailty and disability within the disablement process continuum.
  • To determine if frailty precedes disability and its position in the progression towards severe functional limitations.

Main Methods:

  • A prospective cohort study of 943 participants aged 75+ from the French Three-City (3C) study.
  • Utilized the Fried frailty phenotype, Instrumental Activities of Daily Living (IADL), and basic Activities of Daily Living (ADL) assessments.
  • Employed Cox's regression models to analyze 4-year mortality risk across defined groups (robust, pure frailty, frailty with IADL disability, frailty with IADL and ADL disabilities).

Main Results:

  • 82% of participants fit the assumed hierarchy: 61.3% robust, 5.4% frail, 10.5% frail with IADL disability, and 4.8% frail with IADL and ADL disabilities.
  • An additional 17% were IADL-disabled without frailty, exhibiting similar characteristics and mortality risk to the 'pure frailty' group.
  • These findings suggest an intermediate stage between robustness and severe disability, with frailty potentially occurring earlier.

Conclusions:

  • Frailty may occur upstream in the disablement process, preceding disability.
  • Integrating frailty into the disablement continuum offers a more comprehensive understanding of aging-related functional decline.
  • Identifying frailty early could enable timely interventions to potentially reverse or mitigate the progression to disability.