2.5. Inclusion and Exclusion Criteria
a disability
RECRUITMENT
To be eligible for the study, the following inclusion criteria were established: (1) aged between 15 and 17 years at the recruitment stage; (2) caring for family member(s) (e.g., parents, siblings, grandparents) or significant other(s) (e.g., friends, schoolmates or neighbours) with a disability, chronic physical and/or mental health condition or substance use issue and/or problems related to old age [In response to the COVID-19 pandemic and to boost the recruitment of AYCs, the Swedish Ethical Review Authority and the Vrije University Amsterdam Research Ethics Review Committee approved the target group to be expanded from 15–17 years to 14–17 years. In the UK, the competent research ethics committee approved the target group to be expanded to 14–18-year-olds. 