Participants were recruited in two low-SEP neighborhoods—defined as having a SEP-score below the national average—in the city of Utrecht during two rounds of data collection. During the first round (October and November 2018), participants (n = 14) were recruited in a shopping centre in the city district of Overvecht. Of the fourteen participants who were recruited, two participants were not eligible for inclusion in the study based on their educational level and therefore are omitted from data analysis. A preliminary analysis of the data was conducted in order to grasp whether data saturation had been reached. As some new topics emerged from the last interviews that prompted further exploration, additional participants (n = 3) were recruited in a community centre in the city district of Rivierenwijk. Formal assessment of thematic saturation using the methodology described by Guest et al. [21] showed that, by using a base size of 4, we reached the 0% new information threshold at 12 + 1 interviews, indicating that during the 13th interview, no additional relevant themes were identified.

During the first round of data collection, the researcher approached shoppers and briefly explained the purpose of the interview. If shoppers were interested in participating in the interview, the researcher immediately invited the participant to a nearby restaurant where the interview took place. Reasons for refusing to participate were mainly related to time concerns (e.g., people were busy doing their groceries). During the second round of data collection, the researcher approached potential participants during an informal coffee morning in a community centre among mostly elderly community members and volunteers. If they expressed interest in participating in the interview, the researcher immediately invited them to a quieter table in the community centre where the interview took place. During the second round of data collection, none of the approached potential interviewees refused to participate. Table 1 provides an overview of participants characteristics.

Participant characteristics.

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