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An item reduction analysis of the Group Questionnaire
Jennifer Jensen1, Gary Burlingame1
1Department of Psychology.
Psychotherapy (Chicago, Ill.)
|June 5, 2018
Summary
Shortening the Group Questionnaire (GQ) to 12 items (GQ-12) created a psychometrically sound measure. However, this reduction significantly decreased the number of clinical alerts, indicating a loss of valuable patient information.
Area of Science:
- Psychometrics
- Clinical Psychology
- Group Therapy Research
Background:
- Balancing measure brevity for practice with informational depth is challenging.
- Shorter measures offer convenience but risk reduced psychometrics and potential floor/ceiling effects.
Purpose of the Study:
- To evaluate the impact of shortening the Group Questionnaire (GQ) on its clinical utility and psychometric properties.
- To develop and validate a 12-item version of the Group Questionnaire (GQ-12).
Main Methods:
- Utilized archival data from 1,087 participants for GQ-12 creation via multilevel structural equation modeling.
- Employed clinical and statistical judgment for item selection based on correlation and factor loading.
- Assessed clinical utility by comparing alerts generated by the full-length GQ-30 and the shortened GQ-12.
Main Results:
- The GQ-12 demonstrated good model fit and acceptable reliability.
- A significant reduction in clinical alerts was observed with the GQ-12 compared to the GQ-30.
- Sensitivity for status alerts decreased from 82-93% to 52-67%, while specificity remained high (97-100%).
Conclusions:
- A psychometrically sound shortened feedback measure (GQ-12) can be developed.
- Clinicians must recognize that shortening feedback measures may lead to a loss of crucial clinical information and alerts.
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