Contact information
Type
Scientific
Primary contact
Dr Astrid Mueller
ORCID ID
Contact details
Department of Psychosomatic Medicine and Psychotherapy
University Hospital of Erlangen
Schwabachanlage 6
Erlangen
D-91054
Germany
+49 (0)9131 85 34890
astrid.mueller@uk-erlangen.de
Additional identifiers
EudraCT number
ClinicalTrials.gov number
Protocol/serial number
N/A
Study information
Scientific title
Acronym
Study hypothesis
Disorder specific group Cognitive Behavioural Therapy (CBT) can improve the compulsive buying behaviour.
Ethics approval
Ethics approval received from the Institutional Ethics Committee of the University Hospital of Erlangen (Germany) on the 27th August 2003 (ref: 3008).
Study design
Randomised, controlled, efficacy study comparing CBT with waiting list control.
Primary study design
Interventional
Secondary study design
Randomised controlled trial
Trial setting
Hospitals
Trial type
Treatment
Patient information sheet
Condition
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
Phase
Not Specified
Drug names
Primary outcome measure
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.
Secondary outcome measures
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.
Overall trial start date
01/11/2003
Overall trial end date
30/05/2007
Reason abandoned (if study stopped)
Eligibility
Participant inclusion criteria
1. Current compulsive buying problems according to the criteria of McElroy et. al. (1994)
2. Aged 18 and over
Participant type
Patient
Age group
Adult
Gender
Both
Target number of participants
60
Participant exclusion criteria
1. Active suicidal ideation
2. Current mania
Recruitment start date
01/11/2003
Recruitment end date
30/05/2007
Locations
Countries of recruitment
Germany
Trial participating centre
Department of Psychosomatic Medicine and Psychotherapy
Erlangen
D-91054
Germany
Sponsor information
Organisation
University Hospital of Erlangen (Germany)
Sponsor details
Erlanger Leistungsbezogene Anschubfinanzierung und Nachwuchsforderung (ELAN) fund
Universitatsstrasse 40
Erlangen
D-91054
Germany
+49 (0)9131 85 23708
annette.pfeiffer@zuv.uni-erlangen.de
Sponsor type
Hospital/treatment centre
Website
Funders
Funder type
Hospital/treatment centre
Funder name
University Hospital of Erlangen (Germany) - Erlanger Leistungsbezogene Anschubfinanzierung und Nachwuchsforderung (ELAN) fund
Alternative name(s)
Funding Body Type
Funding Body Subtype
Location
Funder name
Bavarian Savings Bank Foundation (Germany)
Alternative name(s)
Funding Body Type
Funding Body Subtype
Location
Results and Publications
Publication and dissemination plan
Not provided at time of registration
Intention to publish date
Participant level data
Not provided at time of registration
Basic results (scientific)
Publication list
Results in http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=17868641
Publication citations
-
Results
Mueller A, Mueller U, Albert P, Mertens C, Silbermann A, Mitchell JE, de Zwaan M, Hoarding in a compulsive buying sample., Behav Res Ther, 2007, 45, 11, 2754-2763, doi: 10.1016/j.brat.2007.07.012.