Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale

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Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale

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Publication Article, peer reviewed scientific
Title Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale
Author(s) Bjorner, Jakob Bue ; Petersen, Morten Aa ; Groenvold, Mogens ; Aaronson, Neil K ; Ahlner Elmqvist, Marianne ; Arraras, Juan I ; Brédart, A ; Fayers, Peter ; Jordhøy, Marit S ; Sprangers, Mirjam AG ; Watson, M ; Young, T ; European Organisation for Research and Treatment of Cancer Quality of Life Group
Date 2004
English abstract
BACKGROUND: As part of a larger study whose objective is to develop an abbreviated version of the EORTC QLQ-C30 suitable for research in palliative care, analyses were conducted to determine the feasibility of generating a shorter version of the 4-item emotional functioning (EF) scale that could be scored in the original metric. METHODS: We used data from 24 European cancer studies conducted in 10 different languages (n = 8242). Item selection was based on analyses by item response theory (IRT). Based on the IRT results, a simple scoring algorithm was developed to predict the original 4-item EF sum scale score from a reduced number of items. RESULTS: Both a 3-item and a 2-item version (item 21 'Did you feel tense?' and item 24 'Did you feel depressed?') predicted the total score with excellent agreement and very little bias. In group comparisons, the 2-item scale led to the same conclusions as those based on the original 4-item scale with little or no loss of measurement efficiency. CONCLUSION: Although these results are promising, confirmatory studies are needed based on independent samples. If such additional studies yield comparable results, incorporation of the 2-item EF scale in an abbreviated version of the QLQ-C30 for use in palliative care research settings would be justified. The analyses reported here demonstrate the usefulness of the IRT-based methodology for shortening questionnaire scales.
DOI http://dx.doi.org/10.1007/s11136-004-7866-x (link to publisher's fulltext)
Publisher SpringerLink
Host/Issue Quality of Life Research;10
Volume 13
ISSN 0962-9343
Pages 1683-97
Language eng (iso)
Subject(s) Cancer
IRT
Palliative care
Prediction
Quality of Life
Shortening of scales
Medicine
Research Subject Categories::MEDICINE
Handle http://hdl.handle.net/2043/7605 (link to this page)

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