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Quality of Life Research

, Volume 22, Issue 10, pp 2939–2940 | Cite as

What does Cronbach’s alpha tell us about the EQ-5D? A methodological commentary to “Psychometric properties of the EuroQol Five-Dimensional Questionnaire (EQ-5D-3L) in caregivers of autistic children”

  • Uwe Konerding
Commentary

In a paper just accepted for publication in Quality of Life Research, Khanna et al. [1] investigate the psychometric properties of the EQ-5D with three levels [2] using data from a sample of 316 US—American caregivers of autistic children. The authors examine convergent and discriminant validity of the five EQ-5D dimensions by analyzing the relation of these dimensions with the dimensions of the SF-12v2 [3], and they examine known group validity by analyzing how the severity of the children’s autism relates to the EQ-5D index and the VAS scale. With a few exceptions, the results of these examinations accord with the authors’ expectations. The authors interpret this as evidence for the EQ-5D’s validity. The authors also examine the reliability of the EQ-5D. For this purpose, they compute Cronbach’s alpha and item-total correlations for the five dimensions of the EQ-5D. Cronbach’s alpha is only 0.63, whereas the item-total correlations range from 0.25 for anxiety/depression to 0.58 for...

Keywords

Measurement Instrument Autistic Child Homogenous Test Group Validity Item Selection 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Khanna, R., Jariwala, K., Bentley, J. P. (2013). Psychometric properties of the EuroQol Five Dimensional Questionnaire (EQ-5D-3L) in caregivers of autistic children. Quality of Life Research [Epub ahead of print].Google Scholar
  2. 2.
    The EuroQol Group. (1990). EuroQol—a new facility for the measurement of health-related quality of life. Health Policy, 16(3), 199–208.CrossRefGoogle Scholar
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    Ware, J. E., Kosinski, M., Turner-Bowker, D. M., & Gandek, B. (2002). User’s manual for the SF-12v2 health survey (with a supplement documenting SF-12 health survey). Lincoln, RI: Quality Metric Incorporated.Google Scholar
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    Nunnally, J. C. (1978). Assessment of reliability. Psychometric theory (2nd ed., pp. 225–255). New York: MacGraw-Hill Series.Google Scholar
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    Cronbach, L. (1951). Coefficient alpha and the internal structure of tests. Psychometrika, 16, 297–334.CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.BambergGermany

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