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Quality of Life Research

, Volume 24, Issue 2, pp 287–293 | Cite as

Combination of classical test theory (CTT) and item response theory (IRT) analysis to study the psychometric properties of the French version of the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF)

  • Stéphanie Bourion-BédèsEmail author
  • Raymund Schwan
  • Jonathan Epstein
  • Vincent Laprevote
  • Alex Bédès
  • Jean-Louis Bonnet
  • Cédric Baumann
Article

Abstract

Objective

The study aimed to examine the construct validity and reliability of the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF) according to both classical test and item response theories.

Method

The psychometric properties of the French version of this instrument were investigated in a cross-sectional, multicenter study. A total of 124 outpatients with a substance dependence diagnosis participated in the study. Psychometric evaluation included descriptive analysis, internal consistency, test–retest reliability, and validity. The dimensionality of the instrument was explored using a combination of the classical test, confirmatory factor analysis (CFA), and an item response theory analysis, the Person Separation Index (PSI), in a complementary manner.

Results

The results of the Q-LES-Q-SF revealed that the questionnaire was easy to administer and the acceptability was good. The internal consistency and the test–retest reliability were 0.9 and 0.88, respectively. All items were significantly correlated with the total score and the SF-12 used in the study. The CFA with one factor model was good, and for the unidimensional construct, the PSI was found to be 0.902.

Conclusion

The French version of the Q-LES-Q-SF yielded valid and reliable clinical assessments of the quality of life for future research and clinical practice involving French substance abusers. In response to recent questioning regarding the unidimensionality or bidimensionality of the instrument and according to the underlying theoretical unidimensional construct used for its development, this study suggests the Q-LES-Q-SF as a one-dimension questionnaire in French QoL studies.

Keywords

Quality of life Substance abusers Psychometric validation 

Notes

Conflict of interest

None.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Stéphanie Bourion-Bédès
    • 1
    • 2
    • 3
    Email author
  • Raymund Schwan
    • 2
  • Jonathan Epstein
    • 3
    • 4
  • Vincent Laprevote
    • 2
  • Alex Bédès
    • 5
  • Jean-Louis Bonnet
    • 6
  • Cédric Baumann
    • 3
    • 4
  1. 1.Service médico-psychologique régionalMetzFrance
  2. 2.CSAPA (Health Care Centre of Accompaniment and Prevention in Addictology)University Hospital of NancyNancyFrance
  3. 3.EA4360 APEMACUniversity of LorraineNancyFrance
  4. 4.Service d’épidémiologie et évaluation cliniques, INSERM CIC-EC CIE6CHU de NancyNancyFrance
  5. 5.ANPAA 15-CSAPA (Health Care Centre of Accompaniment and Prevention in Addictology)Saint-FlourFrance
  6. 6.ANPAA 15-CSAPA (Health Care Centre of Accompaniment and Prevention in Addictology)AurillacFrance

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