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Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis
PURPOSE: This paper presents two studies exploring the latent structure of item sets used in the development of the Recovering Quality of Life mental health outcome measures: ReQoL-10 and ReQoL-20. METHOD: In study 1, 2262 participants completed an initial set of 61 items. In study 2, 4266 participa...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer International Publishing
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6439178/ https://www.ncbi.nlm.nih.gov/pubmed/30578454 http://dx.doi.org/10.1007/s11136-018-2091-1 |
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author | Keetharuth, Anju Devianee Bjorner, Jakob Bue Barkham, Michael Browne, John Croudace, Tim Brazier, John |
author_facet | Keetharuth, Anju Devianee Bjorner, Jakob Bue Barkham, Michael Browne, John Croudace, Tim Brazier, John |
author_sort | Keetharuth, Anju Devianee |
collection | PubMed |
description | PURPOSE: This paper presents two studies exploring the latent structure of item sets used in the development of the Recovering Quality of Life mental health outcome measures: ReQoL-10 and ReQoL-20. METHOD: In study 1, 2262 participants completed an initial set of 61 items. In study 2, 4266 participants completed a reduced set of 40 items. Study 2 evaluated two formats of the questionnaires: one version where the items were intermingled and one where the positively worded and negatively worded items were presented as two separate blocks. Exploratory and confirmatory factor analyses were conducted on both datasets where models were specified using ordinal treatment of the item responses. Dimensionality based on the conceptual framework and methods effects reflecting the mixture of positively worded and negatively worded items were explored. Factor invariance was tested across the intermingled and block formats. RESULTS: In both studies, a bi-factor model (study 1: RMSEA = 0.061; CFI = 0.954; study 2: RMSEA = 0.066; CFI = 0.971) with one general factor and two local factors (positively worded questions and negatively worded questions) was preferred. The loadings on the general factor were higher than on the two local factors suggesting that the ReQoL scale scores can be understood in terms of a general factor. Insignificant differences were found between the intermingled and block formats. CONCLUSIONS: The analyses confirmed that the ReQoL item sets are sufficiently unidimensional to proceed to item response theory analysis. The model was robust across different ordering of positive and negative items. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11136-018-2091-1) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-6439178 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Springer International Publishing |
record_format | MEDLINE/PubMed |
spelling | pubmed-64391782019-04-15 Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis Keetharuth, Anju Devianee Bjorner, Jakob Bue Barkham, Michael Browne, John Croudace, Tim Brazier, John Qual Life Res Article PURPOSE: This paper presents two studies exploring the latent structure of item sets used in the development of the Recovering Quality of Life mental health outcome measures: ReQoL-10 and ReQoL-20. METHOD: In study 1, 2262 participants completed an initial set of 61 items. In study 2, 4266 participants completed a reduced set of 40 items. Study 2 evaluated two formats of the questionnaires: one version where the items were intermingled and one where the positively worded and negatively worded items were presented as two separate blocks. Exploratory and confirmatory factor analyses were conducted on both datasets where models were specified using ordinal treatment of the item responses. Dimensionality based on the conceptual framework and methods effects reflecting the mixture of positively worded and negatively worded items were explored. Factor invariance was tested across the intermingled and block formats. RESULTS: In both studies, a bi-factor model (study 1: RMSEA = 0.061; CFI = 0.954; study 2: RMSEA = 0.066; CFI = 0.971) with one general factor and two local factors (positively worded questions and negatively worded questions) was preferred. The loadings on the general factor were higher than on the two local factors suggesting that the ReQoL scale scores can be understood in terms of a general factor. Insignificant differences were found between the intermingled and block formats. CONCLUSIONS: The analyses confirmed that the ReQoL item sets are sufficiently unidimensional to proceed to item response theory analysis. The model was robust across different ordering of positive and negative items. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11136-018-2091-1) contains supplementary material, which is available to authorized users. Springer International Publishing 2018-12-21 2019 /pmc/articles/PMC6439178/ /pubmed/30578454 http://dx.doi.org/10.1007/s11136-018-2091-1 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Article Keetharuth, Anju Devianee Bjorner, Jakob Bue Barkham, Michael Browne, John Croudace, Tim Brazier, John Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title | Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title_full | Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title_fullStr | Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title_full_unstemmed | Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title_short | Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis |
title_sort | exploring the item sets of the recovering quality of life (reqol) measures using factor analysis |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6439178/ https://www.ncbi.nlm.nih.gov/pubmed/30578454 http://dx.doi.org/10.1007/s11136-018-2091-1 |
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