Feasibility and effects of an eHealth intervention to support patients with a low socioeconomic position during their waiting period preceding cardiac rehabilitation 115 6 contacted potential participants for consent. Interested patients were then contacted by the investigator (JF), who explained the study. If they agreed to participate, they received an information letter and had an appointment scheduled for the initial assessment. 6.2.3 Measures 6.2.3.1 Adherence Adherence to the intervention was measured using the metrics (1) use period length: the number of days between the first and last day the intervention was used; (2) percentage of active days: percentage of days the intervention was used; (3) daily use time: average time spent on the intervention per active day within the use period, and (4) the total number of viewed messages. 6.2.3.2 Acceptance Acceptance was measured using a modified Usefulness, Satisfaction, and Ease of use (USE) questionnaire. The original USE questionnaire consists of 30 items on a 7-point Likert scale focusing on usefulness, satisfaction, ease of use, and ease of learning (Lund, 2001). In alignment with the specific needs and challenges faced by our target population of individuals with a low SEP, we recognized that lengthy questionnaires often lead to disengagement among this group (Bonevski et al., 2014). Therefore, we adapted the original questionnaire to a more manageable version with only 9 of the original items (3 per category) on a 5-point Likert scale, focusing on usefulness, satisfaction, and ease of use (see Supplementary Appendix 1). The questions retained were chosen for their relevance to the unique context and goals of the current intervention. 6.2.3.3 Certainty and guidance and influencing factors We developed the Certainty and Guidance Questionnaire (CGQ), consisting of 7 items measured using a 5-point Likert scale, for use in this study (see Supplementary Appendix 1). High scores indicate good certainty and guidance. The questionnaire focuses on patient needs identified in a previous study (Faber et al., 2023a). These needs include feeling certain during the waiting period, confidence to be physically active, managing expectations about the contents of CR, good management of emotions, the feeling of hope for future recovery, understanding the current health status and feeling guided before the start of CR. The questions are derived from existing scales, including the Motivation for Traumatic Brain Injury Rehabilitation Questionnaire (MOT-Q) for motivation (Chervinsky et al., 1998), the Patient Evaluation of Emotional Comfort Experienced (PEECE) for experienced emotional comfort (Williams et al., 2017), and the Credibility
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