Table 2.

Assessments and timeline for participants

Time-point	Baseline		6 months (post-randomisation)		15 months (approx. 12 months post-randomisation)
	Parent/Carer	Young Person	Parent/Carer	Young Person	Parent/Carer	Young Person
Pre-entry into trial
Participant details	✓
Inclusion/exclusion criteria	✓
Informed consent	✓
Assent		✓
Screeninga		✓a
Trial
Medical history	✓
SMFQ (primary outcome)a	✓	✓a	✓	✓	✓	✓
PRADAS	✓		✓		✓
IPPA	✓	✓	✓	✓	✓	✓
PSES	✓		✓		✓
DERS-SF		✓		✓		✓
Short WEMWBS	✓		✓		✓
CAS-8		✓		✓		✓
SDQ	✓	✓	✓	✓	✓	✓
DAWBA		✓				✓
CHU-9D		✓		✓		✓
EQ-5D-5L-Y		✓		✓		✓
EQ-5D-5L	✓		✓		✓
EQ5D-5L-Y proxy	✓		✓		✓
Client service receipt inventory	✓		✓		✓
Intervention satisfaction survey			✓		✓

^aSMFQ at baseline will be collected during screening for young person