Chapter 6 114 Manteghinejad & Javanmard, 2021; Moro Visconti & Morea, 2020). In theory, eHealth interventions offer a cost-effective alternative to face-to-face sessions (Frederix et al., 2017; Kraal et al., 2017; Manteghinejad & Javanmard, 2021; Moro Visconti & Morea, 2020; Scherrenberg et al., 2020). However, in practice, people with a low SEP often do not adhere to these interventions due to low technology access, low digital literacy, and other life priorities (Arsenijevic et al., 2020; Reiners et al., 2019). The success of these interventions depends on tailoring them to the specific needs, abilities, and preferences of this group (Kerkhoff et al., 2022). We recently developed the Inclusive eHealth Guide (IeG) to support the design of tailored eHealth interventions according to the specific needs of individuals with a low SEP (Faber & Al-Dhahir et al., 2023). The guide combines existing knowledge on barriers and facilitators in eHealth development for individuals with a low SEP (Al-Dhahir et al., 2023). It considers, amongst others, the target group’s context, needs, preferences, and skills (Faber et al., 2021). We applied the IeG in a participatory design process of an eHealth intervention specifically for and with cardiac patients with a low SEP. The intervention addresses their needs during the waiting period before CR (Faber et al., 2023a). This study aimed to evaluate the feasibility of this eHealth intervention tailored toward CR patients with a low SEP in the domains of adherence and acceptance. Additionally, it explored the effects of the eHealth intervention on feelings of certainty and guidance, factors associated with changes in these constructs, and dropout rates during subsequent CR. 6.2 Methods 6.2.1 Study design The feasibility study was executed between February 2023 and September 2023 at Capri Cardiac Rehabilitation, a CR center with sites in Rotterdam and The Hague (The Netherlands). The participants were randomized to an intervention group and control group, and outcomes were assessed at the start and end of the waiting period before CR started. 6.2.2 Recruitment Eligible participants were adults aged 18 or above living in a low-SEP neighborhood, referred to CR by their cardiologist, able to understand Dutch (with assistance), and had a mobile device with internet access. Postal codes of potential participants were sent to the principal investigator (JF) to assess neighborhood SEP, based on the neighborhood residents’ average income and education levels. We used a list of 40 neighborhoods identified by the Dutch government for their socioeconomic challenges as a benchmark (Minister voor Wonen Wijken en Integratie, 2007 ). A representative from the CR center first
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