“…Although age at transition is likely to vary between services and regions, it usually occurs between ages 16–18 years old (except for some very specialist care and early adopters of young person pathways covering care until 25th birthday). 23 We therefore defined time before, during and after transition as ages 10–15, 16–18 and 19–24 years old, respectively, 24 to reflect the typical configuration of transition services in England.…”