Table 3 Feasibility measurement, measurement definition, and feasibility criteria

Acceptability

• Percentage of eligible patients who agree to participate in the trial

• Patients’ choice of type of informal caregiver

Measures of social network members as informal caregivers:

• Percentage of potential caregivers who accepts to be an informal caregiver

• Percentage assessed to have prerequisites to be an informal caregiver

25% of patients who are screened and found to be lonely agree to participate in the trial

50% of invited social network members accept participation and is assessed to have prerequisites to be an informal caregiver

Adherence

• Percentage of informal caregivers participating in all three intervention consultations with the trial staff

• Percentage in contact with the patient at least once a week face to face, by phone or virtually

75% of informal caregivers participate in three out of four consultations

75% of included patients adhere to the intervention, i.e., having contact with the informal caregiver once a week for a minimum of 8 out of 12 weeks

Loss to follow-up

• Percentage of patients and informal caregivers who do not complete the trial

A maximum of 25% of informal caregivers do not attend two out of three intervention consultations with the trial staff attend

A maximum of 25% of patients do not complete the trial

Resource consumption

• Time resources used to include study participants

• Time resources used to complete the three nurse consultations

N/A for feasibility