Table 1 Instruments to assess primary outcome, secondary outcomes, moderators, mediators, and common factors

Primary outcome measure

Depressive symptoms

BDI-II (21)

x

x

x

x

x

x

HAMD-7 (7)

x

x

Secondary outcome measures

Generalized anxiety

GAD-7 (7)

x

x

x

x

Well-being

WHO-5 (5)

x

x

x

x

Diabetes-related distress

PAID (20)

x

x

x

x

Intersession changes in mood***

Emotion Thermometers (5)

Glycemic control (from patients’ records)

HbA1c

x

x

Moderators

Psychological moderators

Neuroticism

NEO-FFI (12)

x

Attachment style

ECR-S (12)

x

x

History of depression

SCID

x

Demographic characteristics

-

x

Biological moderators

Diabetes specific characteristics (from patients’ records)

-

x

Degradation of tryptophan

trp/kyn

x

Mediators

Cognitive coping

Positive re-interpretation and positive refocusing

CERQ (8)

x

x

x

x

x

Reappraisal and distraction

TCQ (12)

x

x

x

x

x

Behavioral activation

Behavioral activation

BADS (7)

x

x

x

x

x

Rumination

Rumination

RRQ (12)

x

x

x

x

x

Mindfulness

Non-judgmental attitude and act with awareness

FFMQ (16)

x

x

x

x

x

Attention control

Self-Regulation Scale (10)

x

x

x

x

x

Self-compassion

Self-kindness, self-judgment, and overidentification

SCS (13)

x

x

x

x

x

Common factors

Therapeutic alliance

WAI-12 (12) & 18-item Rapport Quest. (18)

x

x

Patient expectancy

- (3)

x