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Psychometric properties and factor structure of a long and shortened version of the cognitive and behavioural responses questionnaire
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Ryan, Elizabeth G., Vitoratou, Silia, Goldsmith, Kimberley A. and Chalder, Trudie (2018) Psychometric properties and factor structure of a long and shortened version of the cognitive and behavioural responses questionnaire. Psychosomatic Medicine, 80 (2). pp. 230-237. doi:10.1097/PSY.0000000000000536 ISSN 0033-3174.
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Official URL: http://dx.doi.org/10.1097/PSY.0000000000000536
Abstract
Objective
Symptoms of chronic fatigue syndrome (CFS) can be perpetuated by cognitive and behavioral responses to the illness. We aimed to determine the factor structure, reliability, and validity of the 40-item Cognitive and Behavioural Responses Questionnaire (CBRQ) using data gathered from CFS patients. We also propose a short-version CBRQ for greater clinical utility.
Methods
The psychometric analysis was performed on data sets drawn from two sources: a clinical service for CFS patients (n = 576) and the PACE randomized controlled trial of CFS treatments (n = 640). An exploratory factor analysis was conducted on the clinical data set and a confirmatory factor analysis was performed on the randomized controlled trial data set. Using these results, a short version of the CBRQ was proposed. Reliability, metric invariance across age and sex, and construct validity were assessed.
Results
The exploratory factor analysis (relative χ2 = 2.52, root mean square error of approximation = 0.051, comparative fit index = 0.964, Taylor-Lewis Index = 0.942) and confirmatory factor analysis (relative χ2 = 4.029, root mean square error of approximation = 0.069, comparative fit index = 0.901, Taylor-Lewis Index = 0.892) revealed that eight-factor models fitted the data well. Satisfactory Cronbach's α values were obtained for the final subscales (≥0.76). The shortened CBRQ was obtained by removing items that cross-loaded onto other factors and/or were the lowest loading items in each factor. The shortened CBRQ contained 18 items that had high factor loadings, good face validity, and reliability (Cronbach's α = 0.67–0.88).
Conclusions
The CBRQs, long and short versions, are reliable and valid scales for measuring cognitive and behavioral responses of patients with CFS. Further research is needed to examine the utility of the CBRQ in other long-term conditions.
Item Type: | Journal Article | ||||||||||||||||||||||||
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Subjects: | B Philosophy. Psychology. Religion > BF Psychology R Medicine > RB Pathology |
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Clinical Trials Unit Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Chronic fatigue syndrome -- Psychological aspects, Psychometrics, Questionnaires | ||||||||||||||||||||||||
Journal or Publication Title: | Psychosomatic Medicine | ||||||||||||||||||||||||
Publisher: | Lippincott, Williams & Wilkins | ||||||||||||||||||||||||
ISSN: | 0033-3174 | ||||||||||||||||||||||||
Official Date: | 1 February 2018 | ||||||||||||||||||||||||
Dates: |
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Volume: | 80 | ||||||||||||||||||||||||
Number: | 2 | ||||||||||||||||||||||||
Page Range: | pp. 230-237 | ||||||||||||||||||||||||
DOI: | 10.1097/PSY.0000000000000536 | ||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||
Date of first compliant deposit: | 15 February 2018 | ||||||||||||||||||||||||
Date of first compliant Open Access: | 1 February 2019 | ||||||||||||||||||||||||
RIOXX Funder/Project Grant: |
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