Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis
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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.
I: Quality of Life Research, Bind 28, Nr. 4, 2019, s. 1005-1015.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Exploring the item sets of the Recovering Quality of Life (ReQoL) measures using factor analysis
AU - Keetharuth, Anju Devianee
AU - Bjorner, Jakob Bue
AU - Barkham, Michael
AU - Browne, John
AU - Croudace, Tim
AU - Brazier, John
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Bi-factor model
KW - Dimensionality
KW - Factor analysis
KW - Latent structure
KW - Recovering Quality of Life
U2 - 10.1007/s11136-018-2091-1
DO - 10.1007/s11136-018-2091-1
M3 - Journal article
C2 - 30578454
AN - SCOPUS:85058993654
VL - 28
SP - 1005
EP - 1015
JO - Quality of Life Research
JF - Quality of Life Research
SN - 0962-9343
IS - 4
ER -
ID: 241095399