Table 1.

Outcome measures used at different assessment points in the study

Domains	Primary or secondary measure	Instrument	T1a	T2b	T3c
Health and well-being	Depression (primary)	Patient Health Questionnaire-9	✓	✓	✓
	Anxiety (primary)	Beck Anxiety Inventory	✓	✓	✓
	Health-related quality of life (secondary)	The COPD Assessment Test	✓	✓	✓
	Self-efficacy (secondary)	General Self-Efficacy Scale	✓	✓	✓
Intervention response	Participant satisfaction	Client Satisfaction Questionnaire		✓
	Therapeutic alliance	Working Alliance Inventory-Short		✓
Demographic and health-related Information	Stable demographic factors	Interview	✓
	Variable demographic factors and health factors	Interview	✓	✓	✓

Note:

^aBaseline assessment,

^bpostintervention assessment,

^cfollow-up assessment 8 weeks after the CBT/befriending intervention.

Abbreviation: CBT, cognitive behavior therapy.