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MoodGYM improves population wellbeing
In a large UK web RCT, automated MoodGYM raised mental well-being versus wait-list control despite high intervention attrition.
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What intervention was tested?
Fully automated web CBT package MoodGYM.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
What trial design was used?
Two-arm RCT: MoodGYM versus waiting-list control.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
How many people were randomized?
3070 completed consent/baseline and were randomized.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
What was the primary endpoint?
Mental well-being measured by WEMWBS at 6- and 12-week follow-ups.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
Was there a differential treatment effect?
Yes—intervention × time interaction was highly significant (P<.001).
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
How large was the 12-week WEMWBS gap?
About 2.876 points favoring MoodGYM.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
What approximate effect size was reported?
Cohen d ≈ 0.34 (small-to-moderate).
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
What was attrition in each arm?
73.5% intervention vs 26.9% control.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
Where were participants recruited?
Self-recruited users of the UK NHS Choices website.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
What did control participants receive during the trial?
No specific intervention or email reminders (wait-list), with access to general NHS Choices well-being pages.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified
Why is high intervention dropout a teaching point?
It can bias follow-up estimates and shows adherence challenges of fully automated programs.
Source: Effectiveness of a web-based cognitive-behavioral tool to improve mental well-being in the general population: randomized controlled trial · DOI · quote verified