Table 3 Details of interventions and control procedures

Engagement, listening, positive regard, empathy, collaboration

A

B

C

D

1–6

Structured & manualised to ensure focus, fidelity and homogeneity

A

B

C

D

1–6

Between-session activity for participant

A

B

C

D

1–6

Provision of structured self-help material relating to mechanism

A

B

C

-

1–6

Therapeutic work on non-targeted causal mechanisms excluded

A

B

C

D

1–6

Psychological formulation of causal mechanism and capacity (during trial)

A

B

C

-

1–2

Normalising via presentation of destigmatising written/audio-visual material

A

-

-

-

1–2

Behavioural experiments & anti-stigma data logs to reduce stigma beliefs and strengthen non-stigmatising illness beliefs

A

-

-

-

3–4

Identifying & improving positive-self beliefs, building self-confidence & reducing negative-self beliefs. Use of positive stimuli

-

B

-

-

1–2

Positive data log; positive activity planning (connection to others; being active; learning and giving); strengthening positive-self beliefs

-

B

-

-

3–4

Education about JTC bias, exercises to generate alternative explanations & increase evidence-gathering

-

-

C

-

1–2

Identification and modification of positive beliefs about JTC decision-making, building positive beliefs about evidence-gathering, & practice of non-JTC decision-making

-

-

C

-

3–4

Practice of new strategies and development of shared plan to maintain gains

A

B

C

-

5–6

Assessment only: history taking, additional psychometrics & neuropsychological assessment of factors affecting capacity (formulation after trial completion)

-

-

-

D

1–6

Between session tasks focused on aiding assessment (e.g., life event timeline)

-

-

-

D

1–6