Clinical psychology interventions for reducing obesity have developed alongside pharmacological and surgical treatments, but usually as interventions for individual patients. Any healthcare intervention rests on a logic model: assumptions that through specific physical and social mechanisms, it will produce certain intended outcomes, provided that conducive background conditions (‘contexts’) exist. Using evidence from the feasibility trial preceding a full randomised controlled trial (RCT), this paper assesses the empirical validity of the initial logic model of a new group-based weight management intervention: PROGROUP, designed for patients with body mass index (BMI) ≥40 kg/m² or ≥35 kg/m² with comorbidities. We aimed to test whether:

Multimethod proof-of-concept study by means of realist evaluation of the initial PROGROUP logic model. We:

Specialised ambulatory mental health services in the English NHS.

Adults with severe obesity (BMI ≥40 kg/m² or ≥35 kg/m² with comorbidities).

Group-building techniques to enhance group members’ adoption of evidence-based methods of behaviour change affecting their dietary behaviour and physical activity.

Qualitative outcomes. What kinds of:

Quantitative measures not used.

The initial logic model assumed that the following sequence of mechanisms would produce weight loss: referral from GP to specialist weight management services; further referral to PROGROUP; preparatory individual consultation; facilitated group sessions produce a group identity; group identity reinforces weight management capability and motivation; further individual consultations adjust for individual circumstances; behaviour change outside the treatment setting, producing weight loss. Contexts necessary for these mechanisms to work included: sufficient catchment population; group size, continuity and membership retention; suitable location; facilitator training; and practical support outside the treatment setting.

The findings suggested revisions to the logic model, but more in the delivery components and contextual assumptions than the core therapeutic mechanisms. There was scope to simplify the referral mechanisms. Different professions could implement the model. A realist evaluation of a pre-RCT feasibility study can be used to make the intervention’s logic model more securely evidence-based, serving as a proof-of-concept test for the intervention. It indicated the conditions under which such group psychological interventions might be more widely used.

ISRCTN22088800.

This scoping review aimed to map studies on behaviour change interventions that address antibiotic treatment-seeking behaviour for respiratory tract infections in primary and community care settings.

This review is based on the Joanna Briggs Institute guidelines for scoping reviews, guided by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews.

A literature search in January 2024 and May 2024 was performed across Medline, Embase, CINAHL, PsycINFO, Web of Science Core Collection, Scopus, EThOS and Google Scholar was performed.

Eligible studies described behaviour change interventions in primary and community care settings, published from 2000 onward across all countries.

Descriptive data relating to study details and intervention functions were gathered and organised according to the Capability, Opportunity, Motivation and Behaviour change framework in a predeveloped data extraction sheet. Dual data extraction occurred, and inter-rater reliability results are reported (K=0.83).

The scoping review identified 38 eligible studies, which consisted of randomised controlled trials (7/38), cluster randomised controlled trials (6/38), randomised experiments (5/38), cross-sectional studies (5/38), qualitative investigations (5/38) and quasi-experimental designs (4/38). Most interventions focused on educational resources (15/38), digital tools (7/38) and community campaigns (6/38), with fewer targeting decision-making processes (4/38) or psychological drivers of antibiotic-seeking behaviour (3/38). Only one study was conducted in low-income and middle-income countries, and only one separately assessed behaviour change as a measured outcome.

This scoping review highlights a wide range of research methodologies within the topic area. There was some limited evidence of intervention efficacy for antibiotic prescription rates, particularly interventions focused on enhancing knowledge and access to resources. However, more emphasis is needed on standardising outcome measures and evaluating long-term outcomes.