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Effect size calculations for the clinician: methods and comparability
Jason A Seidel1, Scott D Miller, Daryl L Chow
1a Colorado Center for Clinical Excellence , Denver , CO , USA.
Summary
Calculating effect size in psychotherapy using practice-based evidence can vary significantly. This study recommends three methods, including two practical equations, to improve the consistency of effect size measurements for clinicians.
Area of Science:
- Psychotherapy research
- Clinical psychology
- Practice-based evidence
Background:
- Single-group pre-post effect size is increasingly used in psychotherapy for practice-based evidence and feedback-informed treatment.
- Variability in effect size calculation methods can reduce the interpretability of clinical change.
Purpose of the Study:
- To investigate the impact of different effect size calculation methods on results.
- To identify reliable and practical methods for clinicians.
Main Methods:
- Nine different effect size calculation methods were applied to client data from practicing psychotherapists.
- Data included therapists from a large web-based database.
Main Results:
- Effect sizes varied significantly based on the calculation method used.
- Differences between methods often exceeded 0.40 for individual therapists, impacting clinical interpretation.
Conclusions:
- Three methods are recommended to moderate variability in effect size calculations.
- Two specific equations show potential as valid and practical tools for clinical practice.
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