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Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
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Published on: April 26, 2024

A revised short version of the depression questionnaire.

Giulio Vidotto1, Loretta Moroni, Roberto Burro

  • 1Department of General Psychology, University of Padua, Italy. giulio.vidotto@unipd.it

European Journal of Cardiovascular Prevention and Rehabilitation : Official Journal of the European Society of Cardiology, Working Groups on Epidemiology & Prevention and Cardiac Rehabilitation and Exercise Physiology
|March 11, 2010
PubMed
Summary

A new 15-item Depression Questionnaire (QD-R) was developed for cardiac rehabilitation patients. This shorter version maintains good psychometric properties and is easier to administer, aiding depression monitoring in clinical settings.

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Area of Science:

  • Psychometrics
  • Rehabilitation Medicine
  • Clinical Psychology

Background:

  • The original 24-item Depression Questionnaire (QD) is used in inpatient rehabilitation.
  • Patient characteristics in this setting necessitate a more suitable instrument.
  • A reduced version of the QD is proposed to improve applicability.

Purpose of the Study:

  • To develop and validate a shortened version of the Depression Questionnaire (QD).
  • To create a more practical depression assessment tool for cardiac rehabilitation patients.
  • To maintain or enhance the psychometric properties of the original QD.

Main Methods:

  • Confirmatory factor analysis was applied to the original 24-item QD.
  • Logistic models were used to identify and eliminate items.
  • Clinical observations guided the item reduction process.
  • A final 15-item version (QD-R) was validated using confirmatory factor analysis.

Main Results:

  • Factor analysis supported a monofactorial solution for the QD-24.
  • A 17-item version was suggested, further reduced to 15 items (QD-R) using logistic models.
  • The QD-R demonstrated good separation (0.80) and item-trait interaction.
  • QD-R scores showed a significant negative correlation with the 6-minute walking test distance (r=-0.316).

Conclusions:

  • A combination of statistical methods and clinical insight effectively shortened the QD.
  • The 15-item QD-R is a valid and reliable instrument for assessing depression in rehabilitation.
  • The QD-R is suitable for use with debilitated or elderly patients, offering ease of completion.
  • This shortened questionnaire aids in monitoring depression outcomes in rehabilitation settings.