Journal article
An evaluation of the circadian type questionnaire
Ergonomics, Vol.38(2), pp.347-360
1995
Abstract
This study evaluates the psychometric properties and assesses the test-retest reliability and longer-term stability of scores on the Circadian Type Questionnaire (CTQ) of Folkard et al. (1979) in a sample of 445 students. The scales were found to lack internal consistency and the factor structure originally proposed was not replicated. Cultural variation in CTQ scores was suggested. Test-retest reliability, over three months in a subgroup of 36, was poor for the V and M scales. Longer-term stability, over nine months in a subgroup of 36 who were exposed to shiftwork, was better but significant decreases were found in rigidity of sleeping habits (Rs) and morningness (M) scores. A factor analysis suggested that the scales should be constructed differently; however, the properties of such scales were still not optimal. The CTQ has psychometric flaws and needs to be improved before it could be expected to reliably function as a predictive test of adaptation to shiftwork. © 1995 Taylor & Francis Group, LLC.
Details
- Title
- An evaluation of the circadian type questionnaire
- Authors
- Ken Greenwood (Author) - La Trobe University
- Publication details
- Ergonomics, Vol.38(2), pp.347-360
- Publisher
- Taylor & Francis Ltd.
- Date published
- 1995
- DOI
- 10.1080/00140139508925109
- ISSN
- 0014-0139
- Organisation Unit
- School of Social Sciences - Legacy; University of the Sunshine Coast, Queensland
- Language
- English
- Record Identifier
- 99451135602621
- Output Type
- Journal article
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- Web Of Science research areas
- Engineering, Industrial
- Ergonomics
- Psychology
- Psychology, Applied
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Source: InCites