Cited by 133Digital Mental Health InterventionsMindfulness and Compassion InterventionsAnxiety, Depression, Psychometrics, Treatment, Cognitive Processes

Acceptance and commitment therapy as a web-based intervention for depressive symptoms: Randomised controlled trial

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Pots, Wendy T. M., Fledderus, Martine, Meulenbeek, Peter A. M., ten Klooster, Peter M., Schreurs, Karlein M. G., Bohlmeijer, Ernst T.·2016·British Journal of Psychiatry

Abstract

Background: Depression is a highly prevalent disorder, causing a large burden of disease and substantial economic costs. Web-based self-help interventions seem promising in promoting mental health. Aims: To compare the efficacy of a guided web-based intervention based on acceptance and commitment therapy (ACT) with an active control (expressive writing) and a waiting-list control condition (Netherlands Trial Register NTR1296). Method: Adults with depressive symptoms from the general population were randomised to ACT (n= 82), expressive writing (n= 67) or waiting-list control (n= 87). The main outcome was reduction in depressive symptoms assessed with the Center for Epidemiological Studies – Depression scale. Results: Significant reductions in depressive symptoms were found following the ACT intervention, compared with the control group (Cohen's d= 0.56) and the expressive writing intervention (d= 0.36). The effects were sustained at 6-month and 12-month follow-up. Conclusions: Acceptance and commitment therapy as a web-based public mental health intervention for adults with depressive symptoms can be effective and applicable.

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Crossref · 10.1192/bjp.bp.114.146068

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  • Assuming an 18% attrition rate, the current sample size allows detection of small to moderate effect sizes (d = 0.365) with 80% power at the planned follow-up assessment.

    “Assuming an attrition rate of 18% as in previous trials evaluating the long-term effectiveness of ACT [45, 80], the current sample-size allows us to detect small to moderate effect sizes (i.e., d = 0.365) with a power of 80% at the planned follow-up assessment [81].”

    From Effectiveness of a guided ACT-based self-help resilience training for depressive symptoms during pregnancy: Study protocol of a randomized controlled trial embedded in a prospective cohort. (2020) · cites this paper as [80]

    The Results (page unavailable) report 13% attrition in the ACT group at the 12-month follow-up, not 18%. This source is cited for the assumed attrition rate; the sentence cites a different source for the sample-size and power calculation. (LLM, conf=0.85)

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  • Online ACT interventions and ACT self-help books have been shown to improve psychological flexibility in other populations.

    “online ACT interventions or ACT self-help books could be used in suspected patients of COVID-19, which were proven to improve psychological flexibility in other populations (Pots et al., 2016; Wersebe et al., 2018).”

    From Is psychological flexibility a mediator between perceived stress and general anxiety or depression among suspected patients of the 2019 coronavirus disease (COVID-19)? (2021) · cites this paper as Pots et al., 2016

    The Outcomes section reports significantly greater improvement across measured outcomes, including psychological flexibility, for the web-based ACT group than for the waiting-list and expressive-writing groups. The Acceptance and commitment therapy section also reports earlier evidence for a guided ACT self-help intervention, but this paper does not show that ACT self-help books improve psychological flexibility. Page numbers are unavailable in our copy. (LLM, conf=0.86)

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  • The online module "Living to the Full" was proven effective in reducing psychological distress in adults.

    “the online module “Living to the Full” [28], which was proven to be effective in reducing psychological distress in adults [29, 30].”

    From Cost-effectiveness and cost-utility of an Acceptance and Commitment Therapy intervention vs. a Cognitive Behavioral Therapy intervention for older adults with anxiety symptoms: A randomized controlled trial (2022) · cites this paper as [30]

    The Acceptance and commitment therapy section identifies the web intervention as based on ‘Living to the Full,’ and the Discussion reports significant post-treatment reductions in depressive and anxiety symptoms. The trial enrolled adults with depressive symptoms; it did not establish effectiveness for psychological distress generally across adults. (LLM, conf=0.82)

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  • The results on depression, anxiety, and stress are largely inconsistent with recent research among non-clinical samples, which reported the efficacy of ACT self-help interventions in significantly improving depression, anxiety and stress in distressed participants compared to wait-list.

    “These results are largely inconsistent with recent research among non-clinical samples, which reported the efficacy of ACT self-help interventions in significantly improving depression, anxiety and stress in distressed participants compared to wait-list (Jeffcoat & Hayes, 2012; Pots et al., 2016).”

    From A randomised controlled trial of brief web-based acceptance and commitment Therapy on the general mental health, depression, anxiety and stress of college Students (2022) · cites this paper as Pots et al., 2016

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  • The effect sizes at post-treatment were small to moderate and ranged from 0.35 to 0.56.

    “The effect sizes at post-treatment were small to moderate and ranged from 0.35 to 0.56.”

    From How and for whom does web-based acceptance and commitment therapy work? Mediation and moderation analyses of web-based ACT for depressive symptoms (2016) · cites this paper as [11]

    Table 3 (Study implications) shows post-treatment effect sizes of 0.35–0.56 for ACT compared with expressive writing or the waiting-list control, consistent with the paper’s small-to-moderate classification. The unqualified range does not cover all post-treatment comparisons: expressive writing versus the waiting-list control has effect sizes as low as 0.06. (LLM, conf=0.84)

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2 of the 55 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [18]18. Bohlmeijer E, Hulsbergen M. A Beginner's Guide to Mindfulness: Live in the Moment. Open University Press, 2013.
  2. [40]40. Beekman ATF, Deeg DJH, Van Limbeek J, Braam AW, De Vries MZ, Van Tilburg W. Criterion validity of the Center for Epidemiologic Studies Depression scale (CES-D): results from a community-based sample of older subjects in the Netherlands. Psychol Med 1997; 27: 231-5.

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Authors
Pots, W. T. M., Fledderus, M., Meulenbeek, P. A. M., ten Klooster, P. M., Schreurs, K. M. G., & Bohlmeijer, E. T.
Affiliations
University of Twente (NL)
Corresponding author
Pots, Wendy T. M.
Venue
British Journal of Psychiatry
Published
2016-01
Volume
208
Issue
1
Pages
69-77
ISSN
  • 0007-1250 (ISSN-L)
  • 1472-1465
OpenAlex
W1098503608
Cited by
133
References
55
Citations by year
2026: 3 · 2025: 4 · 2024: 14 · 2023: 11 · 2022: 22 · 2021: 18 · 2020: 12 · 2019: 11 · 2018: 12 · 2017: 15 · 2016: 6 · 2015: 5
FWCI
20.62
Type
journal article
Language
en
Open access
Locations
  • The British Journal of Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
  • University of Twente Research Information (publishedVersion, other-oa)
  • University of Twente Research Information (submittedVersion, other-oa)
Topics
  • Social Sciences › Psychology › Applied Psychology › Digital Mental Health Interventions
  • Social Sciences › Psychology › Clinical Psychology › Mindfulness and Compassion Interventions
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Anxiety, Depression, Psychometrics, Treatment, Cognitive Processes
Keywords
acceptance and commitment therapy, online intervention, depressive symptoms, depression, self-help, expressive writing, public mental health, treatment efficacy, sustained effects
MeSH terms
Adult, Aged, Counseling, Depression, Female, Humans, Male, Middle Aged, Netherlands, Patient Compliance, Psychiatric Status Rating Scales, Logistic Models, Treatment Outcome, Internet, Young Adult, Acceptance and Commitment Therapy

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