Table 1

Data collection methods per research question

	Data collection method
Research questions	Quantitative	Qualitative
1. How do structures and daily routines differ between TCs and usual care?	Not applicable	Observations of healthcare practice and semistructured interviews with healthcare professionals
2. What are healthcare professionals' experienced barriers and facilitators for the organisation of a TC?	Not applicable	Observations of healthcare practice and semistructured interviews with healthcare professionals
3. What are the differences in clinical outcomes and healthcare use of young people who were seen at a TC and those that received usual care?	Retrospective chart reviews of young people's medical records	Not applicable
4. What are the differences in self-management outcomes, experiences and satisfaction with the transfer to adult care, and perceived quality of care of young people who were seen at a TC and those that received usual care?	Survey among young people	Not applicable
5. What are the differences between TCs and regular transition care on the criteria for successful transition?	Retrospective chart review of young people's medical records and survey among young people	Not applicable

TC, transition clinic.