Table 2.

Patient reported outcome measures used and rationale.

Domain.	Measure	Description	Reason for Selection
Perceived social support	MOS-SS	19 questions, inc. emotional, informational, tangible, affectionate, and interactional support	Questions about perception of different types of support, including outside of the family unit, and so reflects goals of intervention.
Loneliness	UCLA 3-item	3 indirect questions on loneliness, distinct from functional support and depressive symptomology	Brief measure of perception of relevant negative social experiences reflecting loneliness, without using word ‘lonely’.
Depression	BEDS	6 questions, based on cognitive and affective depressive symptoms	Brief measure suitable for advanced illness and validated for use in palliative care.
Quality of life	EQ-5D-5L	5 questions-mobility, self-care, usual activities, pain, anxiety/depression-plus visual analogue scale	5 domains commonly used in practice so familiar to participants, 5 L could be more sensitive to change than 3 L version.