Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale
(2004) In Quality of Life Research 13(10). p.1683-1697- 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... (More)
- 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. (Less)
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https://lup.lub.lu.se/record/897956
- author
- organization
- publishing date
- 2004
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- cancer, IRT, palliative care, prediction, quality of life, shortening, of scales
- in
- Quality of Life Research
- volume
- 13
- issue
- 10
- pages
- 1683 - 1697
- publisher
- Springer
- external identifiers
-
- pmid:15651539
- wos:000225186200006
- scopus:13844255794
- ISSN
- 1573-2649
- DOI
- 10.1007/s11136-004-7866-x
- language
- English
- LU publication?
- yes
- id
- 5e69b025-6892-4520-bed4-9f2c829bd231 (old id 897956)
- date added to LUP
- 2016-04-01 17:07:21
- date last changed
- 2022-02-13 02:53:52
@article{5e69b025-6892-4520-bed4-9f2c829bd231, 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.}}, author = {{Bjorner, JB and Petersen, MA and Groenvold, M and Aaronson, N and Ahlner-Elmqvist, Marianne and Arraras, JI and Bredart, A and Fayers, P and Jordhoy, M and Sprangers, M and Watson, M and Young, T}}, issn = {{1573-2649}}, keywords = {{cancer; IRT; palliative care; prediction; quality of life; shortening; of scales}}, language = {{eng}}, number = {{10}}, pages = {{1683--1697}}, publisher = {{Springer}}, series = {{Quality of Life Research}}, title = {{Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale}}, url = {{http://dx.doi.org/10.1007/s11136-004-7866-x}}, doi = {{10.1007/s11136-004-7866-x}}, volume = {{13}}, year = {{2004}}, }