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Measuring global functioning in older adults with cognitive impairments using the Rasch model.

Rocco Palumbo1,2, Alberto Di Domenico3, Federica Piras4

  • 1Department of Psychological, Health and Territorial Sciences, University of Chieti, Via dei Vestini 31, 66100, Chieti, Italy. rocco.palumbo@unich.it.

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Summary

This study introduces a new Rasch model approach to combine cognitive and functional measures into a single global functioning score for older adults with cognitive impairment. This integrated measure offers a more powerful assessment than individual tests for evaluating dementia progression.

Keywords:
Activities of daily livingCognitive impairmentGlobal functioningMCIRasch model

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Area of Science:

  • Gerontology
  • Neuroscience
  • Psychometrics

Background:

  • Cognitive and functional measures are often assessed separately in patients with cognitive impairment.
  • Discordance between separate measures can complicate interpretation, particularly after interventions.
  • A unified approach is needed to better assess global functioning in this population.

Purpose of the Study:

  • To develop and evaluate a novel approach using the Rasch model to integrate cognitive and functional measures.
  • To create a single, more powerful measure of global functioning for older adults with cognitive impairment (including dementia).
  • To assess the utility of this combined measure in differentiating disease severity.

Main Methods:

  • The study involved 265 older adults diagnosed with mild cognitive impairment or dementia.
  • Data included the Mini-Mental State Examination (MMSE), Esame Neuropsicologico Breve (ENB), Activities of Daily Living (ADL), and Instrumental Activities of Daily Living (IADL).
  • The Rasch model was employed to combine these diverse measures into a single global functioning score.

Main Results:

  • The Rasch model successfully created a unified global functioning score.
  • Patients with severe cognitive impairment had lower global functioning scores than those with moderate impairment.
  • The combined global functioning score demonstrated superior discrimination between severe and moderate impairment compared to individual measures (ENB, ADL, IADL).

Conclusions:

  • Cognitive and functional measures can be integrated into a single dimension representing global functioning.
  • This study validates the Rasch model's ability to create a reliable global functioning score.
  • The findings support the development of new instruments for comprehensive global functioning assessment in older adults with varying cognitive impairments.