Table 1 Measurement overview (intake, t0, t1, t2 and t3)

Primary outcome measure

Depressive symptoms

CES-D

X

X

X

X

Secondary outcome measures

Current major depressive episode

MINI

X

X

Anxiety symptoms

HADS-A

X

X

X

X

Quality of life

EQ 5-D

X

X

X

X

Positive mental health

MHC-SF

X

X

X

X

Moderating measures

Demographics (age, gender and education level)

X

Personality

NEO-FFI

X

Past major depressive episodes

MINI

X

Important life events

X

Chronic diseases

X

Mediating measures

Reminiscence functions

RFS

X

X

X

Perceived control

Mastery scale

X

X

X

Automatic positive thoughts

ATQ-P

X

X

X

Meaning in life

MLQ-SF

X

X

X

Measures for the economic evaluation

Resource use

TIC-P

X

X

Production losses

PRODISQ

X

X