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

ISRCTN ISRCTN38444899
DOI https://doi.org/10.1186/ISRCTN38444899
Secondary identifying numbers N/A
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

Study designRandomised, controlled, efficacy study comparing CBT with waiting list control.
Primary study designInterventional
Secondary study designRandomised controlled trial
Study setting(s)Hospital
Study typeTreatment
Scientific title
Study objectivesDisorder 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) studiedCompulsive buying disorder
InterventionThis 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 typeOther
Primary outcome measure1. 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.
Secondary outcome measures1. 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.
Overall study start date01/11/2003
Completion date30/05/2007

Eligibility

Participant type(s)Patient
Age groupAdult
Lower age limit18 Years
SexBoth
Target number of participants60
Key inclusion criteria1. Current compulsive buying problems according to the criteria of McElroy et. al. (1994)
2. Aged 18 and over
Key exclusion criteria1. Active suicidal ideation
2. Current mania
Date of first enrolment01/11/2003
Date of final enrolment30/05/2007

Locations

Countries of recruitment

  • Germany

Study participating centre

Department of Psychosomatic Medicine and Psychotherapy
Erlangen
D-91054
Germany

Sponsor information

University Hospital of Erlangen (Germany)
Hospital/treatment centre

Erlanger Leistungsbezogene Anschubfinanzierung und Nachwuchsforderung (ELAN) fund
Universitatsstrasse 40
Erlangen
D-91054
Germany

Phone +49 (0)9131 85 23708
Email annette.pfeiffer@zuv.uni-erlangen.de
Website http://www.elan.uk-erlangen.de/e404/index_ger.html
ROR logo "ROR" https://ror.org/0030f2a11

Funders

Funder type

Hospital/treatment centre

University Hospital of Erlangen (Germany) - Erlanger Leistungsbezogene Anschubfinanzierung und Nachwuchsforderung (ELAN) fund

No information available

Bavarian Savings Bank Foundation (Germany)

No information available

Results and Publications

Intention to publish date
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryNot provided at time of registration
Publication and dissemination planNot 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