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Outcome Questionnaire: item sensitivity to change.

D A Vermeersch1, M J Lambert, G M Burlingame

  • 1Counseling and Career Center, Brigham Young University, USA. davermee@stlife.byu.edu

Journal of Personality Assessment
|July 6, 2000
PubMed
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Psychotherapy outcome measures should prioritize sensitivity to change. Most items on the Outcome Questionnaire demonstrated this sensitivity, changing as expected in patients and more so than in untreated individuals.

Area of Science:

  • Psychometrics
  • Clinical Psychology
  • Psychotherapy Research

Background:

  • Reliability is often prioritized in psychological trait measures.
  • Measures assessing patient change after psychotherapy require sensitivity to change as a primary property.

Purpose of the Study:

  • To propose and evaluate criteria for item sensitivity to change in psychotherapy outcome measures.
  • To assess the sensitivity to change of items on the Outcome Questionnaire.

Main Methods:

  • Developed two criteria for item sensitivity: change in the proposed direction and significantly greater change in treated vs. untreated individuals.
  • Analyzed change rates of Outcome Questionnaire items in 1,176 psychotherapy patients and 284 untreated controls.
  • Utilized multilevel or hierarchical linear modeling for data analysis.

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Main Results:

  • The majority of items on the Outcome Questionnaire met both proposed criteria for sensitivity to change.
  • Items demonstrated change in the theoretically expected direction post-intervention.
  • Change scores were significantly greater in the psychotherapy group compared to the control group.

Conclusions:

  • The Outcome Questionnaire demonstrates adequate sensitivity to change for measuring psychotherapy outcomes.
  • Findings support the use of the Outcome Questionnaire and inform future test development for psychotherapy measures.
  • Further research should continue to refine methods for assessing change in psychological measures.