Table 2 Variables, measures and assessment points

Eligibility

Diagnosis

✅

Case note review

Participant age, gender, relationship to service user, service-user diagnosis, number of hours of contact per week, living status

Demographic measure

Family member

✅

✅

Self-report

Symptom severity

PANSS

Service user

✅

✅

✅

Researcher administered

Relapse rates

PANSS

Service user

✅

✅

✅

Researcher administered

Hospital episodes

Episode count

Service user

✅

✅

✅

Case note review

Social functioning

PSP

Service user

✅

✅

✅

Researcher-administered interview

Family environment and functioning

FQ

Family member

✅

✅

✅

Researcher-administered interview

Knowledge, attitudes, burden and general health

GHQ-28, ECI, KAST, IEQ

Family member, service user

✅

✅

✅

Researcher-administered interview

Therapeutic engagement

Attendance, retention in the intervention

Trial therapist

✅

✅

Researcher-administered interview

Fidelity to the intervention

FIPAS

Trial therapist

✅

Researcher-administered interview

Acceptability of the intervention

Therapist diaries of number of sessions attended

Trial therapist

✅

Self-reported therapist diaries

Satisfaction with the intervention

Qualitative interviews

Family member, service user and trial therapist

✅

Qualitative interviews and self-report questionnaires