Acceptance and commitment therapy - Do we know enough? Cumulative and sequential meta-analyses of randomized...

Area of Science:

• Clinical Psychology
• Psychotherapy Research
• Evidence-Based Practice

Background:

• Acceptance and Commitment Therapy (ACT) has a growing evidence base for various conditions.
• Existing reviews often cover a broad range of problems, not specific common mental health issues.
• The efficacy of ACT for depression and anxiety requires focused investigation.

Purpose of the Study:

• To meta-analyze trials of ACT specifically for depression and anxiety.
• To critically appraise the sufficiency of the current evidence using sequential meta-analysis (SMA).
• To provide guidance for future research by estimating required participant numbers.

Main Methods:

• Conducted a meta-analysis of randomized controlled trials investigating ACT for depression and anxiety.
• Employed sequential meta-analysis (SMA) techniques to assess the robustness of findings.
• Calculated effect sizes for group and pre-post symptom changes.

Main Results:

• ACT demonstrated moderate effect sizes for symptom reduction in both anxiety and depression.
• SMA indicated insufficient evidence to confidently conclude ACT's efficacy compared to active controls for anxiety.
• SMA also suggested insufficient evidence for ACT's moderate efficacy compared to active controls for depression.

Conclusions:

• While initial findings suggest moderate effects, current evidence is insufficient to confirm ACT's efficacy for anxiety or depression against active controls.
• Further research is needed, with specific participant number estimates provided to guide future study design.
• Future research strategies for ACT in anxiety treatment should consider the lack of demonstrated differential efficacy compared to active controls.