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Table 2 Instruments

From: Binge-eating disorder treatment goes online – feasibility, usability, and treatment outcome of an Internet-based treatment for binge-eating disorder: study protocol for a three-arm randomized controlled trial including an immediate treatment, a waitlist, and a placebo control group

Instrument

Description/Construct

Time point

Interviews

Diagnostic interview for psychiatric disorders, short version (Mini-DIPS; [53])

Structured interview to assess psychiatric disorders according DSM-5.

Duration: approx. 45 min.

t1, t2

Eating Disorder Examination (EDE; German version [54])

Structured interview to assess eating disorder pathology

Duration: approx. 45 min.

t1

Therapists ratings

Clinical global impression scale [55]

Measure of symptom severity, treatment response and the efficacy of treatments in patients with mental disorders. 7 items rated by the clinician.

t1, t2

Self-report questionnaires

Sociodemographic questions (own items)

Sociodemographic questions (gender, age, nationality, sick leave days, prior treatments etc.). 35 items.

t1

Patient’s expectancies regarding the therapy (own items)

Questions to assess attitude and expectations of the patients towards the internet-based treatment. 5 items.

t1

Work and Social Adjustment Scale (WSAS; [56])

Questionnaire to assess functional impairment (in the area of work, family and social functioning). 5 items.

t1, t2, t3

Rosenberg Self-Esteem Scale (RSES; [57]

Measurement of self-esteem. 10 items.

t1, t2, t3

Ein Messinstrument zur Erfassung subjektiver Kompetenzerwartungen (ASKU; [58])

Assessment of subjective expectation of competency. 3 Items.

t1, t2, t3

Sensitivity to Rejection Scale (MSR; [59])

Scale to measure sensitivity to rejection, submissiveness and ability to deal with threat and hostility. 9 items.

t1

Beck Depression Inventory II (BDI-II; German version [60])

Measure of the severity of depressive symptoms. 21 items.

t1, t2, t3

Beck Depression Inventory Fast Screening (BDI-FS; [61])

Short assessment of depressive symptoms (excluding somatic symptoms). 7 items.

Weekly during waiting time and treatment

Beck Anxiety Inventory (BAI; German version [62])

Measures of the severity of anxiety symptoms. 21 items.

t1, t2, t3

Eating Disorder Examination-Questionnaire (EDE-Q; German version [63])

Assessment of eating disorders pathology during the past 28 days. 4 scales: eating concerns, weight concerns, restraint eating, shape concerns. 28 items.

t1, t2, t3

Dutch Eating Behavior Questionnaire (DEBQ; German version [64])

Questions to assess emotional eating. 10 items.

t1, t2, t3

Weekly Binges Questionnaire (WBQ; [12])

Questions to assess frequency of binge-eating episodes and regularity of eating behavior. 7 items.

Weekly during waiting time and treatment

Thought-Shape Fusion Questionnaire (TSF; [65])

Assessment of body-related cognitive distortions triggered by fattening/forbidden foods. 17 items.

t1, t2, t3

Food Craving Questionnaire (FCQ trait, short version; [66])

Measure of the intensity of food cravings on a multidimensional level. 15 items.

t1, t2, t3

Difficulties in Emotion Regulation Scale (DERS; German version [67])

Assessment of central aspects of affective experiences and emotion processing. 36 items.

t1, t2, t3

Negative Effects Questionnaire (NEQ; [68])

Questionnaire to assess potentially adverse and unwanted events in psychological treatments. 32 items.

t2, t3

Adapted version of the Working Alliance Inventory (WAI-SR; [69])

Assessment of main aspects of therapeutic alliance, resource activation, problem actualization, session outcome. 23 items.

Weekly during treatment

Final evaluation of the internet-based treatment (own items)

Assessment of self-reported estimation of therapy outcome. 9 items.

t2, t3

Usability

System Usability Scale (SUS; [70])

10 items to assess usability and user friendliness.

t2

Appreciation [71]

Three-item scale to assess to what extent the media experience was considered meaningful, thought-provoking, and moving.

Weekly during treatment

Emotional Engagement with Character [72]

Four-item subscale to assess emotional engagement with a character; used to measure the engagement with the character of a fictional former patient, whose presence guided the patient through the Internet-based treatment sessions.

t2