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Updated: Nov 25, 2025

Development of a Virtual Reality Assessment of Everyday Living Skills
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Psychometric validation of PROM instruments.

Karl B Christensen1, Jonathan D Comins2,3, Michael R Krogsgaard2

  • 1Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark.

Scandinavian Journal of Medicine & Science in Sports
|December 20, 2020
PubMed
Summary
This summary is machine-generated.

Modern Test Theory (MTT) methods provide a comprehensive validation of patient-reported outcome measures, unlike Classical Test Theory (CTT). MTT analysis is essential for reliable outcome measure validity assessment.

Keywords:
Rasch analysesclassical test theoryconfirmatory factor analysesconstruct validitydifferential item functioningmodern test theorypatient-reported outcome measurespsychometric validation

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Area of Science:

  • Health Outcomes Research
  • Psychometrics
  • Biostatistics

Background:

  • Patient-reported outcome measures (PROMs) are crucial for assessing treatment effectiveness and patient well-being.
  • Statistical validation methods are essential to ensure the reliability and accuracy of PROMs.
  • Classical Test Theory (CTT) and Modern Test Theory (MTT) represent distinct frameworks for PROM validation.

Purpose of the Study:

  • To provide an overview of statistical methods for validating patient-reported outcome measures (PROMs).
  • To compare the efficacy of Classical Test Theory (CTT) and Modern Test Theory (MTT) in validating PROMs.
  • To evaluate the Knee Injury and Osteoarthritis Outcome Score (KOOS) subscales using both CTT and MTT.

Main Methods:

  • Overview of statistical methods from simple to advanced, including specialized software.
  • Non-technical summary of CTT and MTT, detailing confirmatory factor analysis, item response theory, and Rasch analysis.
  • Application of one CTT and three MTT methods to validate KOOS subscales (Symptoms and Quality of Life) under unidimensional and two-dimensional assumptions.

Main Results:

  • CTT methods failed to adequately address key validity issues for the KOOS subscales.
  • Three distinct MTT methods produced highly consistent and similar validation results.
  • Both unidimensional and two-dimensional analyses were performed for each methodology.

Conclusions:

  • MTT methods offer a thorough analysis of all relevant properties for PROM validity.
  • CTT methods do not provide a complete assessment of PROM validity.
  • Claims of sufficient validity based solely on CTT methods are unreliable and should be approached with caution.