|dc.contributor.author||Ford, Shane Alwyn||
|dc.description.abstract||Background: Acceptance and Commitment Therapy (ACT) has shown promise as
an effective intervention in the treatment of mental health disorders. In the last
decade, the delivery of ACT has expanded to include various formats (e.g. groups,
self-help, online and phone apps). Further research is needed to evaluate whether
such delivery formats are a viable extension of ACT. Furthermore, the existing
evidence base of certain alternative delivery formats have yet to be reviewed. This
thesis portfolio sought to contribute to this area of research.
Methods: A systematic review of the literature was conducted to investigate the
efficacy of group-based interventions for mental health disorders using ACT. Five
databases were systematically searched, manual searches were conducted and
corresponding authors were contacted. Studies which used a randomised-controlled
design, with adult samples and investigated group-based ACT interventions for
mental health disorders were included. A meta-analysis of the included studies was
conducted for post-intervention and follow-up data.
In the empirical study, an ACT manual was trialled using a randomised-controlled
design to investigate the efficacy of using ACT in a guided self-help context.
Participants with anxiety/depression were randomly assigned to receive either the
ACT intervention or treatment as usual (TAU). Those in the ACT group were posted
an ACT manual and received two telephone calls. Outcome measures were analysed
after the six-week intervention.
Results: From the meta-analysis, 18 randomised-controlled trials were identified,
14 of which focussed on anxiety and depression. The findings suggest that ACT-based groups have a large effect on symptom reduction when compared to non-active
comparisons at post-treatment and a moderate effect when compared to non-active
comparisons at follow-up. Additionally, there was a small effect in favour of ACT
when compared to active treatment controls at post-treatment and equivalent effects
when comparing ACT to active treatment controls at follow-up. Similar effects were
found when separately comparing the 14 studies which focussed primarily on anxiety
The empirical study revealed that guided self-help was found to be no more effective
in improving quality of life or reducing psychological distress than the TAU group.
However, such results should be interpreted with caution as the small sample size
and high attrition rate indicates that further research with larger samples and follow-up
are needed before strong conclusions can be made.
Conclusions: The findings of this research indicate that group-based ACT
interventions may be a suitable alternative delivery format for service providers in
the provision of common mental health disorders, particularly anxiety and
depression. Further research is needed before any strong conclusions can be made
regarding the efficacy of guided self-help for anxiety/depression.||en
|dc.publisher||The University of Edinburgh||en
|dc.rights||Attribution-NonCommercial-ShareAlike 4.0 International||*
|dc.subject||acceptance and commitment therapy||en
|dc.title||Delivering Acceptance and Commitment Therapy (ACT) for mental health disorders across group and guided self-help formats: a meta-analysis and randomised controlled trial||en
|dc.type||Thesis or Dissertation||en
|dc.type.qualificationname||DClinPsychol Doctor of Clinical Psychology||en