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Why we need a better measure of acceptance: development and initial validation of the Southampton Acceptance Sale

Why we need a better measure of acceptance: development and initial validation of the Southampton Acceptance Sale
Why we need a better measure of acceptance: development and initial validation of the Southampton Acceptance Sale
Acceptance is an important construct across models for understanding psychological distress. Several measures have been designed to capture acceptance, however, there is a lack of evidence regarding the most suitable tool. A systematic review evaluated 20 articles, reporting 32 studies, examining acceptance questionnaires. The methodological quality of included studies were evaluated using the COnsensus-based Standards for the selection of health status Measurement INstruments (COSMIN) checklist. The quality of measurement properties were evaluated using criteria suggested by Terwee et al. (2007). All studies were independently reviewed by two raters, and inter-rater reliability was high. Nine instruments were identified: two unidimensional scales of acceptance, four mindfulness tools with an acceptance subscale, and three emotion regulation scales with an acceptance-based subscale. None of the measures evaluated can be recommended as having superior psychometric properties. Further research is required to demonstrate the psychometric properties of existing measures, given their significant role in evaluating acceptance-based interventions across clinical and research settings.

The lack of a valid and reliable measure of acceptance prevents researchers from drawing conclusions about the efficacy of acceptance-based interventions and identifying the role of acceptance processes in clinical change. Given that there is no current gold standard assessment tool for measuring acceptance, the present study sought to develop and evaluate a new instrument to meet this need. Across three separate studies an initial item pool was evaluated and refined. The resultant measure, named the Southampton Acceptance Scale (SAS), was then evaluated with regards to the factor structure, reliability, and validity. An initial exploratory approach was employed as a unique pool of items with many potential relationships was under investigation. These analyses were subsequently followed up with confirmatory approaches. The SAS, comprising 18-items, was shown to have a theoretically coherent two-factor structure which was validated in an independent sample. The scale has excellent internal consistency, and demonstrated convergent, concurrent and discriminant validity. The SAS has strong psychometric properties and is a promising new measure of acceptance.
University of Southampton
Mc Andrews, Zoe
2753b856-abbd-48b0-90bf-f925eee4b2a3
Mc Andrews, Zoe
2753b856-abbd-48b0-90bf-f925eee4b2a3
Stopa, Lusia
b52f29fc-d1c2-450d-b321-68f95fa22c40
Hart, Claire
e3db9c72-f493-439c-a358-b3b482d55103

Mc Andrews, Zoe (2018) Why we need a better measure of acceptance: development and initial validation of the Southampton Acceptance Sale. University of Southampton, Doctoral Thesis, 165pp.

Record type: Thesis (Doctoral)

Abstract

Acceptance is an important construct across models for understanding psychological distress. Several measures have been designed to capture acceptance, however, there is a lack of evidence regarding the most suitable tool. A systematic review evaluated 20 articles, reporting 32 studies, examining acceptance questionnaires. The methodological quality of included studies were evaluated using the COnsensus-based Standards for the selection of health status Measurement INstruments (COSMIN) checklist. The quality of measurement properties were evaluated using criteria suggested by Terwee et al. (2007). All studies were independently reviewed by two raters, and inter-rater reliability was high. Nine instruments were identified: two unidimensional scales of acceptance, four mindfulness tools with an acceptance subscale, and three emotion regulation scales with an acceptance-based subscale. None of the measures evaluated can be recommended as having superior psychometric properties. Further research is required to demonstrate the psychometric properties of existing measures, given their significant role in evaluating acceptance-based interventions across clinical and research settings.

The lack of a valid and reliable measure of acceptance prevents researchers from drawing conclusions about the efficacy of acceptance-based interventions and identifying the role of acceptance processes in clinical change. Given that there is no current gold standard assessment tool for measuring acceptance, the present study sought to develop and evaluate a new instrument to meet this need. Across three separate studies an initial item pool was evaluated and refined. The resultant measure, named the Southampton Acceptance Scale (SAS), was then evaluated with regards to the factor structure, reliability, and validity. An initial exploratory approach was employed as a unique pool of items with many potential relationships was under investigation. These analyses were subsequently followed up with confirmatory approaches. The SAS, comprising 18-items, was shown to have a theoretically coherent two-factor structure which was validated in an independent sample. The scale has excellent internal consistency, and demonstrated convergent, concurrent and discriminant validity. The SAS has strong psychometric properties and is a promising new measure of acceptance.

Text
Why we need a new measure of acceptance - Zoe McAndrews DClinPsy Thesis 2018 - Version of Record
Restricted to Repository staff only until 29 September 2021.
Available under License University of Southampton Thesis Licence.

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Published date: May 2018

Identifiers

Local EPrints ID: 425918
URI: http://eprints.soton.ac.uk/id/eprint/425918
PURE UUID: 8ba9e4ca-22d0-47bc-ab96-348d7e575ae4

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Date deposited: 06 Nov 2018 17:30
Last modified: 29 Jan 2020 16:46

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