This scale may be especially useful for better monitoring young Mexican patients with T1DM and prevent sequelae of disease.

This research explores if a social marketing intervention model based on social representations theory and the health belief model can generate changes regarding treatment adherence and improve patient self-efficacy. As a pilot, a test–retest field quasi-experiment was designed to evaluate the intervention model with type 1 diabetes (T1DM) patients of families with 8- to 17-year-old children. The intervention model was designed to clarify misconceptions, increase awareness of the benefits of following doctors’ treatments and improve patients’ self-efficacy. In-depth interviews were carried out to gain a richer understanding of the intervention’s effect. The pilot intervention generated a favourable change in shared misconceptions, individual health beliefs, glycaemic control and declared treatment adherence. This paper contributes to the social marketing literature and public health by providing early support for the theoretical assumptions regarding the role of shared misconceptions in physiological and behavioural outcomes for patients with T1DM. Contrary to previous studies, instead of only focusing on individual beliefs, this study incorporates shared beliefs between patients and caregivers, generating more comprehensive behavioural change.

Purpose When social marketing tries to influence behaviours to increase societal welfare, erroneous shared beliefs of the target audiences can become impediments to success. The purpose of this paper is twofold: to categorize shared beliefs that can be obstacles for social marketing programmes and to identify the main sources of those shared beliefs. Design/methodology/approach A qualitative approach was used to examine the specific case of Type 1 diabetes. In-depth interviews with 12 experts and focus groups with 17 adults who had been living with Type 1 diabetes for five years or more were performed. The information was analysed applying thematic analysis. Findings The results indicated that there are two types of shared beliefs that can hinder social marketing efforts (misconceptions and ideological convictions) and three main influencers (primary groups, communication media and authority figures). Practical implications Target audiences can be segmented by their shared beliefs, and a specific message could be designed to reach each group. Social implications Obstacles that could prevent the audience from engaging in a desired positive behaviour could be identified. Originality/value To the author’s knowledge, this is the first study that uses social representations to categorize erroneous shared beliefs that could be barriers for impacting behaviours, as well as the first to identify the main sources of those beliefs. This approach could provide guidelines for the design of social marketing campaigns that could achieve better public engagement.