The development and psychometric evaluation of the group schema therapy rating scale – Revised

E. Bastick; S. Bot; S.J.W. Verhagen; G. Zarbock; J. Farrell; O. Brand-de Wilde; A. Arntz; C.W. Lee

doi:10.1017/S1352465817000741

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The development and psychometric evaluation of the group schema therapy rating scale – Revised

Journal article

Peer reviewed

The development and psychometric evaluation of the group schema therapy rating scale – Revised

E. Bastick, S. Bot, S.J.W. Verhagen, G. Zarbock, J. Farrell, O. Brand-de Wilde, A. Arntz and C.W. Lee

Behavioural and Cognitive Psychotherapy, Vol.46(5), pp.601-618

2018

DOI: https://doi.org/10.1017/S1352465817000741

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Abstract

Background: Recent research has supported the efficacy of schema therapy as a treatment for personality disorders. A group format has been developed (group schema therapy; GST), which has been suggested to improve both the clinical and cost-effectiveness of the treatment. Aims: Efficacy studies of GST need to assess treatment fidelity. The aims of the present study were to improve, describe and evaluate a fidelity measure for GST, the Group Schema Therapy Rating Scale – Revised (GSTRS-R). Method: Following a pilot study on an initial version of the scale (GSTRS), items were revised and guidelines were modified in order to improve the reliability of the scale. Students highly experienced with the scale rated recorded GST therapy sessions using the GSTRS-R in addition to a group cohesion measure, the Harvard Community Health Plan Group Cohesiveness Scale – II (GCS-II). The scores were used to assess internal consistency and inter-rater reliability. Discriminant validity was assessed by comparing the scores on the GSTRS-R with the GCS-II. Results: The GSTRS-R displayed substantial internal consistency and inter-rater reliability, and adequate discriminate validity, evidenced by a weak positive correlation with the GCS-II. Conclusions: Overall, the GSTRS-R is a reliable tool that may be useful for evaluating therapist fidelity to GST model, and assisting GST training and supervision. Initial validity was supported by a weak association with GCS-II, indicating that although associated with cohesiveness, the instrument also assesses factors specific to GST. Limitations are discussed.

Details

Title: The development and psychometric evaluation of the group schema therapy rating scale – Revised
Authors/Creators: E. Bastick (Author/Creator) - Murdoch University
S. Bot (Author/Creator) - University College Maastricht
S.J.W. Verhagen (Author/Creator) - Maastricht University
G. Zarbock (Author/Creator) - Institut für Verhaltenstherapie-Ausbildung Hamburg
J. Farrell (Author/Creator) - Indiana University – Purdue University Indianapolis
O. Brand-de Wilde (Author/Creator)
A. Arntz (Author/Creator) - University of Amsterdam
C.W. Lee (Author/Creator) - The University of Western Australia
Publication Details: Behavioural and Cognitive Psychotherapy, Vol.46(5), pp.601-618
Publisher: Cambridge University Press
Identifiers: 991005539979507891
Copyright: © 2018 British Association for Behavioural and Cognitive Psychotherapies
Murdoch Affiliation: School of Psychology and Exercise Science
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 1 Clinical & Life Sciences; 1.21 Psychiatry; 1.21.1431 Borderline Personality Disorder
Web Of Science research areas: Psychology, Clinical
ESI research areas: Psychiatry/Psychology