Efficacy of a Cognitive Behavioural group Therapy (CBT) for compulsive buying disorder

ISRCTN	ISRCTN38444899
DOI	https://doi.org/10.1186/ISRCTN38444899
Protocol serial number	N/A
Sponsor	University Hospital of Erlangen (Germany)
Funders	University Hospital of Erlangen (Germany) - Erlanger Leistungsbezogene Anschubfinanzierung und Nachwuchsforderung (ELAN) fund, Bavarian Savings Bank Foundation (Germany)

Submission date: 11/09/2007
Registration date: 22/11/2007
Last edited: 22/11/2007

Recruitment status: No longer recruiting
Overall study status: Completed
Condition category: Mental and Behavioural Disorders

Prospectively registered

Protocol

Statistical analysis plan

Results

Individual participant data

Plain English summary of protocol

Not provided at time of registration

Contact information

Dr Astrid Mueller
Scientific

Department of Psychosomatic Medicine and Psychotherapy
University Hospital of Erlangen
Schwabachanlage 6
Erlangen
D-91054
Germany

Phone	+49 (0)9131 85 34890
Email	astrid.mueller@uk-erlangen.de

Study information

Primary study design	Interventional
Study design	Randomised, controlled, efficacy study comparing CBT with waiting list control.
Secondary study design	Randomised controlled trial
Scientific title
Study objectives	Disorder specific group Cognitive Behavioural Therapy (CBT) can improve the compulsive buying behaviour.
Ethics approval(s)	Ethics approval received from the Institutional Ethics Committee of the University Hospital of Erlangen (Germany) on the 27th August 2003 (ref: 3008).
Health condition(s) or problem(s) studied	Compulsive buying disorder
Intervention	This trial is a randomised controlled trial comparing a treatment group with a waiting list control group (2 arms). Because of logistical difficulties a simultaneous conduction of groups was not feasible in this monocentric study. Patients were assigned to groups upon enrolment, which were subsequently randomised to one of two conditions. Thirty-one participants were assigned to one of five CBT groups, and 29 individuals to one of five Waiting List Control (WLC) groups. Participants were blind to the randomisation. Intervention: 12-weekly outpatient disorder specific group CBT-sessions specifically aiming at interrupting and controlling the problematic buying behaviour, establishing healthy purchasing patterns, restructuring maladaptive thoughts and negative feelings associated with shopping and buying, and developing healthy coping skills. Control: Waiting list control. Treatment lasted 12 weeks with one 90-minutes session per week. Groups were conducted with 5 - 8 participants. Follow-up was for 6 months after finishing the treatment for all participants.
Intervention type	Other
Primary outcome measure(s)	1. Compulsive Buying Scale (CBS) 2. Yale-Brown Obsessive Compulsive Scale - Shopping Version (Y-BOCS-SV) 3. German Compulsive Buying Scale (G-CBS) All participants were assessed at baseline. Participants assigned to CBT were assessed at the end of treatment and at the end of a 6-months follow-up period. Individuals assigned to the WLC were reassessed 12 weeks after the baseline assessment. All assessments were conducted by research staff members who remained blind to the treatment assignment throughout the study. Participants completed all self-report questionnaires during the assessment visits.
Key secondary outcome measure(s)	1. Symptom Check-List-90-R (SCL-90-R) 2. Barratt Impulsiveness Scale (BIS-11) 3. Saving Inventory - Revised (SI-R) All participants were assessed at baseline. Participants assigned to CBT were assessed at the end of treatment and at the end of a 6-months follow-up period. Individuals assigned to the WLC were reassessed 12 weeks after the baseline assessment. All assessments were conducted by research staff members who remained blind to the treatment assignment throughout the study. Participants completed all self-report questionnaires during the assessment visits.
Completion date	30/05/2007

Eligibility

Participant type(s)	Patient
Age group	Adult
Lower age limit	18 Years
Sex	All
Target sample size at registration	60
Key inclusion criteria	1. Current compulsive buying problems according to the criteria of McElroy et. al. (1994) 2. Aged 18 and over
Key exclusion criteria	1. Active suicidal ideation 2. Current mania
Date of first enrolment	01/11/2003
Date of final enrolment	30/05/2007

Locations

Countries of recruitment

Germany

Study participating centre

Department of Psychosomatic Medicine and Psychotherapy

Erlangen
D-91054
Germany

Results and Publications

Individual participant data (IPD) Intention to share	No
IPD sharing plan summary	Not provided at time of registration
IPD sharing plan

Study outputs

Output type	Details	Date created	Date added	Peer reviewed?	Patient-facing?
Results article	Results	01/11/2007		Yes	No