Procedures
’ non-verbal behaviors
For the qualitative inquiry part of this study, information will be obtained from a subsample of the quantitative study, encompassing a varied group of children, caregivers, and healthcare professionals involved to gain insight into their individual experiences and perspectives regarding the multi-modal lifestyle intervention. The qualitative part will consist of individual semi-structured in-depth interviews with children, their caregivers, and healthcare professionals. Caregivers will receive a formal letter explaining the qualitative study and an informed consent form. The researcher will only contact those with written informed consent to schedule an interview.The researcher will assess all interviews. Interviews will preferably be face-to-face or via an online system (for example, Microsoft Teams) and will last approximately 45–60 min. Interviews will be digitally recorded or audio-recorded with the participant’s permission. The interviews will be recorded to ensure accuracy in data capture and transcribed verbatim. Immediately after each interview, participants’ non-verbal behaviors and emotions will be logged. Furthermore, a reflective journal will document the process of data collection. Caregivers and children will be interviewed separately. Each participant will be interviewed twice (before the start of the intervention and 26 weeks after the intervention).The professionals will be interviewed at their workplace at a convenient time for them. A researcher will assess all interviews. Interviews will last 45–60 min. Each professional will be interviewed once (26 weeks after the intervention).