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Development of computerized adaptive testing (CAT) for the EORTC QLQ-C30 physical functioning dimension.

Morten Aa Petersen1, Mogens Groenvold, Neil K Aaronson

  • 1The Research Unit, Department of Palliative Medicine, Bispebjerg Hospital, Bispebjerg bakke 23, 2400, Copenhagen NV, Denmark. mpet0009@bbh.regionh.dk

Quality of Life Research : an International Journal of Quality of Life Aspects of Treatment, Care and Rehabilitation
|October 26, 2010
PubMed
Summary
This summary is machine-generated.

A new item pool for computerized adaptive testing (CAT) of physical functioning (PF) was developed and validated. This CAT instrument is expected to enhance the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) measurement of PF.

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Area of Science:

  • Psychometrics
  • Health Outcomes Research
  • Cancer Care

Background:

  • Computerized adaptive testing (CAT) utilizes item response theory (IRT) for personalized patient-reported outcome instruments.
  • The European Organisation for Research and Treatment of Cancer (EORTC) Quality of Life Group is developing a CAT version of the EORTC QLQ-C30.
  • Physical functioning (PF) is a critical component of quality of life in cancer patients.

Purpose of the Study:

  • To develop and psychometrically validate an item pool for the physical functioning (PF) scale of the EORTC QLQ-C30 CAT instrument.
  • To adapt the EORTC QLQ-C30 to individual patients while ensuring score comparability.
  • To improve the measurement of physical functioning in cancer patients.

Main Methods:

  • An initial pool of 56 candidate items was generated through literature review and expert/patient input.
  • Responses were collected from 1,176 cancer patients across six countries (Denmark, France, Germany, Italy, Taiwan, UK).
  • Psychometric properties of the items were evaluated using item response theory (IRT) models.

Main Results:

  • 31 items demonstrated acceptable fit within a unidimensional IRT model and provided good content coverage.
  • The item pool may have limitations in representing patients with very good physical functioning.
  • Differential item functioning (DIF) was identified but had minimal impact on physical functioning (PF) estimation.

Conclusions:

  • An item pool for the CAT measurement of physical functioning (PF) has been successfully established.
  • The developed CAT instrument is anticipated to significantly enhance the EORTC's measurement of PF.
  • This advancement supports more precise and individualized assessment of physical functioning in cancer patients.