Table 2.

Intended questionnaires and assessment times.

			T0	T1	T2	T3
Questionnaire	Measurement	Screening	Pre-test	Post-test	Follow-upa	Follow-upb
MHC-SF	Well-being/ flourishing	X	X	X	X	X
FS	Social-psychological well-being		X	X	X	X
HADS	Symptoms of depression and anxiety	X			X	X
m-DES	Positive and negative emotions		X	X	X	Xd
SUS	Use of strengths		X	X	X	Xd
LOT-R	Optimism		X	X	X	Xd
SCS-SF	Self-compassion		X	X	X	Xd
BRS	Resilience		X	X	X	Xd
SPR	Positive relations		X	X	X	Xd
EPQ-RSS	Extraversion and neuroticism		X
NEO-FFI	Conscientiousness		X
MCQ	Direct medical consumption costs		X	Xc	Xc	X
PCQ	Non-medical productivity costs		X			X
Brugha Life-events	Positive and negative life-events		X	X	X	X
CSQ-8	Client satisfaction			Xd
Process evaluation	Invested time, adherence, positive changes			Xd		Xe
	Level of (continued) use					X
Demographics	Gender, age, education, marital status, living situation, ethnicity, daily activities	X

^a 6 months after T0.

^b 12 months after T0.

^c Only medical health care costs are assessed, not medication costs.

^d Only assessed in the experimental groups, not the control group.

^e Only assessed in the control group, not the experimental groups.