Condition category
Mental and Behavioural Disorders
Date applied
11/09/2007
Date assigned
22/11/2007
Last edited
22/11/2007
Prospective/Retrospective
Retrospectively registered
Overall trial status
Completed
Recruitment status
No longer recruiting

Plain English Summary

Not provided at time of registration

Trial website

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 measures

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

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

http://www.elan.uk-erlangen.de/e404/index_ger.html

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

Results - basic reporting

Publication summary

Results in http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=17868641

Publication citations

  1. 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.

Additional files

Editorial Notes