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15-07-2023 | Original Article

Psychometric Properties of Trichotillomania Severity Measures

Auteurs: Kathryn E. Barber, Douglas W. Woods, Christopher C. Bauer, Michael P. Twohig, Stephen M. Saunders, Scott N. Compton, Martin E. Franklin

Gepubliceerd in: Cognitive Therapy and Research | Uitgave 1/2024

Abstract

Background

Trichotillomania (TTM) is a psychiatric disorder that leads to significant hair loss, distress, and impairment. Few validated measures exist to assess TTM, and psychometric research examining these tools is sparse. This study evaluated the psychometric properties of commonly used TTM severity measures and extended prior research by including hair loss severity ratings in our analyses.

Methods

Participants included 91 adults (92.3% Female; M age = 35.0) with TTM who completed baseline assessments as part of a randomized clinical trial of psychotherapy for TTM. TTM measures included the Massachusetts General Hospital Hairpulling Scale (MGH-HS) and National Institute of Mental Health Trichotillomania Severity Scale (NIMH-TSS). Independent evaluators rated photos of participants’ most severely affected pulling sites using a one-item hair loss severity scale.

Results

Results showed mixed psychometric properties for TTM measures. The MGH-HS showed acceptable internal consistency (alpha = 0.83; omega = 0.89), while the NIMH-TSS had lower internal consistency (alpha = 0.52; omega = 0.73). Both the MGH-HS and NIMH-TSS demonstrated low test-retest reliability. Total scores on the MGH-HS and NIMH-TSS were not associated with hair loss severity.

Conclusions

Given these findings, it is imperative to develop new, psychometrically-sound TTM measures. These results also emphasize the importance of a multi-method approach to TTM assessment. In addition to self-report and clinician-administered measures, hair loss severity ratings may offer valuable information as part of a comprehensive assessment of TTM.

vorige artikel Reliability, Validity and Factor Structure of the Polish Version of the Massachusetts General Hospital Hair Pulling Scale

volgende artikel Mental Health Providers’ Knowledge of Trichotillomania and Skin Picking Disorder, and Their Treatment

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Titel: Psychometric Properties of Trichotillomania Severity Measures
Auteurs: Kathryn E. Barber
Douglas W. Woods
Christopher C. Bauer
Michael P. Twohig
Stephen M. Saunders
Scott N. Compton
Martin E. Franklin
Publicatiedatum: 15-07-2023
Uitgeverij: Springer US
Gepubliceerd in: Cognitive Therapy and Research / Uitgave 1/2024
Print ISSN: 0147-5916
Elektronisch ISSN: 1573-2819
DOI: https://doi.org/10.1007/s10608-023-10406-4

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