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01-11-2013 | Uitgave 9/2013

Quality of Life Research 9/2013

Psychometric evaluation of the EORTC computerized adaptive test (CAT) fatigue item pool

Tijdschrift:
Quality of Life Research > Uitgave 9/2013
Auteurs:
Morten Aa. Petersen, Johannes M. Giesinger, Bernhard Holzner, Juan I. Arraras, Thierry Conroy, Eva-Maria Gamper, Madeleine T. King, Irma M. Verdonck-de Leeuw, Teresa Young, Mogens Groenvold
Belangrijke opmerkingen
Johannes M. Giesinger: co-1st author.
This study is conducted on behalf of the EORTC Quality of Life Group.

Abstract

Purpose

Fatigue is one of the most common symptoms associated with cancer and its treatment. To obtain a more precise and flexible measure of fatigue, the EORTC Quality of Life Group has developed a computerized adaptive test (CAT) measure of fatigue. This is part of an ongoing project developing a CAT version of the widely used EORTC QLQ-C30 questionnaire.

Methods

Based on the literature search and evaluations by experts and patients, 41 new fatigue items were developed (in addition to the three QLQ-C30 fatigue items). Psychometric properties of the items, including evaluations of dimensionality, fit to item response theory (IRT) model, and differential item functioning (DIF), were assessed in an international sample of cancer patients.

Results

Responses were obtained from 1,321 cancer patients coming from eight countries. Factor analysis showed that 37 of the items could be included in a unidimensional model (RMSEA = 0.098, TLI = 0.995, CFI = 0.920). Of the 37 items, two were deleted because of poor fit to the IRT model forming the basis for the CAT, and one because of DIF between cancer sites.

Conclusions

We have established a 34-item fatigue bank allowing for more precise and flexible measurement of fatigue, while still being backward compatible with the QLQ-C30 fatigue scale.

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