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Enhancing precision of the Telephone Interview for Cognitive Status-Modified (TICS-M) using the Rasch model.

Quoc C Truong1, Carol Choo2, Katya Numbers3

  • 1School of Psychology, University of Waikato.

Psychological Assessment
|May 25, 2023
PubMed
Summary

The Telephone Interview for Cognitive Status-modified (TICS-M) shows excellent reliability for assessing cognitive function in older adults. Adjustments using Rasch methodology improve its accuracy for dementia screening.

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Area of Science:

  • Gerontology
  • Psychometrics
  • Cognitive Neuroscience

Background:

  • The Telephone Interview for Cognitive Status-modified (TICS-M) is a key tool for assessing cognitive function and screening for dementia in older populations.
  • Evaluating and enhancing the psychometric properties of cognitive assessment tools is crucial for accurate clinical diagnosis and research.

Purpose of the Study:

  • To psychometrically evaluate the Telephone Interview for Cognitive Status-modified (TICS-M) using Rasch methodology.
  • To improve the precision and accuracy of the TICS-M for assessing global cognitive function and screening for dementia.

Main Methods:

  • Applied the Partial Credit Rasch model to TICS-M scores from 432 older adults (aged 70-90), including those diagnosed with dementia.
  • Combined misfitting and locally dependent items into super-items to achieve optimal Rasch model fit.

Main Results:

  • Initial analysis revealed good reliability but identified misfitting items and local dependency issues.
  • The modified TICS-M demonstrated excellent reliability (PSI = 0.86), strict unidimensionality, and invariance across demographic and clinical factors.
  • A transformation table was created to convert TICS-M raw scores into interval-level data, enhancing precision.

Conclusions:

  • The TICS-M is a reliable instrument for cognitive assessment in older adults.
  • Minor adjustments using Rasch methodology significantly improve TICS-M accuracy and precision without altering its format.
  • The enhanced TICS-M and its transformation table offer improved tools for assessing cognitive decline and screening for dementia.