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Related Experiment Video

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A Two-interval Forced-choice Task for Multisensory Comparisons

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Published on: November 9, 2018

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.

Psychotherapy Research : Journal of the Society for Psychotherapy Research

|November 6, 2013

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.

Keywords:

clinical change effect size effectiveness outcome measurement psychotherapy outcomes

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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.