What makes self-help interventions effective in the management of depressive symptoms? Meta-analysis and meta-regression

@article{Gellatly2007WhatMS,
  title={What makes self-help interventions effective in the management of depressive symptoms? Meta-analysis and meta-regression},
  author={Judith Gellatly and Peter Bower and Sue Hennessy and David A. Richards and Simon Gilbody and Karina Lovell},
  journal={Psychological Medicine},
  year={2007},
  volume={37},
  pages={1217 - 1228}
}
ABSTRACT Background Although self-help interventions are effective in treating depression, less is known about the factors that determine effectiveness (i.e. moderators of effect). This study sought to determine whether the content of self-help interventions, the study populations or aspects of study design were the most important moderators. Method Randomized trials of the effectiveness of self-help interventions versus controls in the treatment of depressive symptoms were identified using… 
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Acceptance and Commitment Therapy (ACT) is a form of psychotherapy with growing evidence for its transdiagnostic effects. Traditionally face-to-face, ACT is also delivered in self-help formats. As
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