Fig. 1

Final acceptability constructs and themes by participant group. The figure presents study qualitative themes organised by groups of theoretical framework of acceptability comprising seven constructs synthesised by Sekhon et al. [26]. ‘Affective attitude’ pertains to how an individual feels about MI. ‘Burden’ captures the amount of effort to participate in and complete MI sessions. ‘Opportunity cost’ measures benefits sacrificed or activities forgone to participate in and complete MI sessions. ‘Intervention coherence’ reflects how participants understand the intervention logic of MI. ‘Self-efficacy’ refers to confidence to perform standard behaviors required in MI participation. ‘Perceived effectiveness’ evaluates how MI is perceived as likely to achieve its purpose. Prominent acceptability constructs and their corresponding themes are highighted along the stages of participation. MI Motivational interviewing, TFA Theoretical framework of acceptability