Table 1

Outcome measures and time-points for collection

Measure	Participant				Participating supporter
Measure	Eligibility and consent visit	Baseline due <2 months prior to the intervention start date	8 months due <2 weeks before and <8 weeks after the 8 month anniversary of randomisation	12 months due <2 weeks before and <8 weeks after the 12 month anniversary of randomisation, if within study timelines	Baseline same timings as participant baseline visit	8 months same timings as participant 8 month visit
Capacity assessment	✓
Mini Mental State Examination	✓
Eligibility checklist	✓				✓
Baseline demographics	✓				✓
DEMQOL		✓	✓*	✓
EQ-5D-5L		✓	✓	✓	✓	✓
PHQ-9		✓	✓		✓	✓
GAD-7		✓	✓
GSE		✓	✓
DFS		✓	✓
SMAS		✓	✓
IADL		✓	✓	✓
HSCRU			✓	✓
SCQ					✓	✓

*Denotes the primary outcome measure.
DEMQOL, Dementia-Related Quality of Life; DFS, Diener’s Flourishing Scale; EQ-5D-5L, European Quality of Life-5 Dimensions, 5 level version; GAD-7, Generalised Anxiety Disorder-7; GSE, General Self-Efficacy Scale; HSCRU, Health and Social Care Resource Use Questionnaire; IADL, Instrumental Activities of Daily Living; PHQ-9, Patient Health Questionnaire-9; SCQ, Sense of Competency Questionnaire; SMAS, Self-Management Ability Scale.