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  3. Logic Model Development Through A Feasibility Rct For A Group-based Weight Management Programme.
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  3. Logic Model Development Through A Feasibility Rct For A Group-based Weight Management Programme.

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Logic model development through a feasibility RCT for a group-based weight management programme.

Rod Sheaff1, Shokraneh Moghadam2, Laura Hollands3

  • 1Peninsula Medical School, Plymouth University, Plymouth, UK r.sheaff@plymouth.ac.uk.

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|March 24, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

This study evaluated the PROGROUP weight management intervention logic model using a realist evaluation. Findings suggest refining delivery and context, not core mechanisms, for broader application of group psychological interventions.

Keywords:
BehaviorObesityOrganisation of health servicesPsychosocial InterventionWeight Gain

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Area of Science:

  • Clinical psychology
  • Obesity interventions
  • Health services research

Background:

  • Clinical psychology interventions for obesity are often individualized.
  • Healthcare interventions rely on logic models detailing mechanisms, outcomes, and contexts.
  • PROGROUP is a novel group-based weight management intervention for severe obesity.

Purpose of the Study:

  • To assess the empirical validity of the PROGROUP intervention's logic model.
  • To test if PROGROUP's components yield intended outcomes and how.
  • To determine if PROGROUP can be practically implemented and how delivery affects the program.

Main Methods:

  • Realist evaluation of the PROGROUP logic model using a pre-randomized controlled trial (RCT) feasibility study.
  • Elicited the logic model and compared it with feasibility data from NHS sites (2021-2023).
  • Revised the logic model based on data, assessing tolerance for delivery variations.

    • Main Results:

    • The initial logic model outlined a sequence of mechanisms for weight loss, including group identity reinforcement.
    • Necessary contexts included sufficient population, group retention, suitable location, facilitator training, and support.
    • Revisions focused on delivery components and contextual assumptions, with scope to simplify referral mechanisms.

    Conclusions:

    • The logic model requires refinement in delivery and context, not core therapeutic mechanisms.
    • Different professional groups can implement the PROGROUP model.
    • Realist evaluation of feasibility studies enhances intervention logic models and identifies conditions for wider use.