Cheyne, Jacqueline E; del Pozo de Bolger, Andrea; Wootton, Bethany M

Author(s)

Cheyne, Jacqueline E

del Pozo de Bolger, Andrea

Wootton, Bethany M

Publication Date

2018-10-01

Abstract

Trichotillomania (TTM) is characterized by repetitive hair pulling resulting in hair loss. The Trichotillomania Dimensional Scale (TTM-D) is a newly developed DSM-5 scale that aims to assess the symptoms of TTM dimensionally. The aim of this current study was to examine the psychometric properties of the TTM-D in a sample of 483 participants. Principal Component Analysis indicated a single factor structure of the TTM-D. Internal consistency and test retest reliability was high (α = 0.89 and r = 0.91 respectively). The TTM-D demonstrated excellent convergent validity with the Massachusetts General Hospital Hair Pulling Scale (MGH-HPS; rs = 0.90) and divergent validity with the Depression Anxiety and Stress Scale (DASS-21; rs = 0.45). Further, the TTM-D demonstrated equivalence between online and pen-and-paper administrations (rs = 0.93). The findings suggest that the psychometric properties of TTM-D are sound and well supported within a community sample.

Citation

Journal of Obsessive-Compulsive and Related Disorders, v.19, p. 61-65

ISSN

2211-3657

2211-3649

Link

https://hdl.handle.net/1959.11/26247

Publisher

Elsevier BV

Title

Reliability and validity of the Trichotillomania Dimensional Scale (TTM-D)

Type of document

Journal Article

Entity Type

Publication

Author(s)	Cheyne, Jacqueline E del Pozo de Bolger, Andrea Wootton, Bethany M
Publication Date	2018-10-01
Abstract	Trichotillomania (TTM) is characterized by repetitive hair pulling resulting in hair loss. The Trichotillomania Dimensional Scale (TTM-D) is a newly developed DSM-5 scale that aims to assess the symptoms of TTM dimensionally. The aim of this current study was to examine the psychometric properties of the TTM-D in a sample of 483 participants. Principal Component Analysis indicated a single factor structure of the TTM-D. Internal consistency and test retest reliability was high (α = 0.89 and r = 0.91 respectively). The TTM-D demonstrated excellent convergent validity with the Massachusetts General Hospital Hair Pulling Scale (MGH-HPS; rs = 0.90) and divergent validity with the Depression Anxiety and Stress Scale (DASS-21; rs = 0.45). Further, the TTM-D demonstrated equivalence between online and pen-and-paper administrations (rs = 0.93). The findings suggest that the psychometric properties of TTM-D are sound and well supported within a community sample.
Citation	Journal of Obsessive-Compulsive and Related Disorders, v.19, p. 61-65
ISSN	2211-3657 2211-3649
Link	https://hdl.handle.net/1959.11/26247
Publisher	Elsevier BV
Title	Reliability and validity of the Trichotillomania Dimensional Scale (TTM-D)
Type of document	Journal Article
Entity Type	Publication

Reliability and validity of the Trichotillomania Dimensional Scale (TTM-D)

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