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

Bjorner, JB; Petersen, MA; Groenvold, M; Aaronson, N; Ahlner-Elmqvist, Marianne LU ; Arraras, JI; Bredart, A; Fayers, P; Jordhoy, M and Sprangers, M, et al. (2004) In Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation 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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keywords
cancer, IRT, palliative care, prediction, quality of life, shortening, of scales
in
Quality of life research : an international journal of quality of life aspects of treatment, care and rehabilitation
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
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5e69b025-6892-4520-bed4-9f2c829bd231 (old id 897956)
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2008-01-10 12:49:16
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2017-08-27 05:39:04
@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},
  keyword      = {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 : an international journal of quality of life aspects of treatment, care and rehabilitation},
  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},
  volume       = {13},
  year         = {2004},
}