Table 2

Measurement tools and questions at each time point

	Measures	Baseline	Mid	Post	3-Month follow-up
Demographics		√
Process evaluation
Expectancy of benefit (baseline) and intervention acceptability and patient satisfaction (post-treatment)	CEQ38	√		√
Primary outcomes
Depression	PHQ-945	√	√	√	√
	Mini International Neuropsychiatric Interview V.5.0.0 MDD module40	√			√
DM distress	PAID48	√	√	√	√
Glycemic control	Self-reported HbA1c	√		√	√
Secondary outcomes
Psychological distress	K-1050	√	√	√	√
Lifestyle behaviours	The Fantastic Checklist51	√		√	√
Disability, functional impairment and well-being	The SF-1252	√		√	√
Eating habits	PHQ—Eating module53	√		√	√
Alcohol	PHQ—Alcohol module53	√		√	√
Anxiety	GAD-754	√		√	√
Somatization	PHQ-1553	√		√	√
Moderators
Attachment style	The Relationships Questionnaire55	√

CEQ, Treatment Credibility/Expectancy Questionnaire; DM, diabetes mellitus; GAD-7, Generalized Anxiety Disorder 7-Item; HbA1c, glycosylated hemoglobin; K-10, Kessler-10; MDD, major depressive disorder; PAID, Problem Areas in DM Questionnaire; PHQ-9, Patient Health Questionnaire—9-Item; PHQ-15, PHQ—Physical symptoms module.