Trial setting, eligibility and participants
DSM-5
DISORDER, RECRUITMENT, DISORDERS
Participating CAMHS were organisations delivering medical and psychosocial interventions for children/adolescents with mental health and/or neuropsychiatric/developmental disorders. Services could be publicly or privately funded but had to have a formal upper age limit (the SB) for providing care. Forensic services and highly specialised services were excluded. The child/adolescent to adult mental health SB was typically 18 years but varied according to local practice (online Supplementary Table S2). Eligible participants were YP with a mental disorder defined by DSM-IV-TR, DSM-5 or ICD 10/11, who were receiving CAMHS care, with an IQ ⩾ 70 and within 1 year of reaching CAMHS SB. Recruitment occurred between 1st October 2015 and 31st December 2016. Because transition decisions were sometimes made after the YP reached the SB, we amended the eligibility criteria (in April 2016) to include YP who were up to 3-months older than the SB.Participants were identified by clinicians, and other care staff, and recruited by local study personnel. The YP's parent (legal guardian, a partner, an older adult sibling or another individual) was also invited to participate, provided the young person agreed. Written informed consent was obtained from all participants. For YP below the age of consent (UK <16, Europe <18), a parent/legal guardian was required to provide consent, with the YP signing an assent form. YP involved in the study were offered incentives as ‘token of thanks’ for participating. Incentives were shopping vouchers (in all countries but Italy and Croatia) and/or being entered into a prize draw (Singh et al., 