Bergen Four-Day Treatment (B4DT) for Obsessive-Compulsive Disorder

June 11, 2026 updated by: Tampere University Hospital

The aim of this study is to expand access to Bergen Four-Day Treatment (B4DT) in Finland and to integrate it into psychiatric care pathways at Tampere University Hospital (TAYS). A Bergen team has been established within TAYS Psychiatry and has been trained in collaboration with the B4DT team from HUS and the Norwegian developers. The objective of this study is to enhance understanding of the model's adaptability to the Finnish healthcare system, evaluate healthcare professionals' attitudes toward the intervention, and assess treatment outcomes.

The aim is to recruit approximately 35 patients for the study. Patients will be recruited from a minimum of three groups (15 patients) and up to a maximum of six groups (35 patients). The criteria for admission to B4DT and for participation in the study are identical. The treatment and the study may include patients receiving specialized psychiatric care at Tampere University Hospital who have been diagnosed with obsessive-compulsive disorder and who experience significant impairment due to their symptoms. In addition, personnel from TAYS Psychiatry who recommend and refer patients for B4DT will be recruited for the study. The estimated number of participating staff members is approximately 30.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

65

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • diagnosed with obsessive-compulsive disorder
  • willingness to participate in exposure-based treatment

Exclusion Criteria:

  • intellectual disability
  • autism spectrum disorder that precludes engagement in psychotherapeutic work
  • a psychotic disorder with current psychotic symptoms
  • underweight or very rapid weight loss affecting cognition
  • severe suicidality
  • substance dependence
  • benzodiazepine medication (use of Z-drugs as sleep medication is permitted)
  • In addition, ongoing psychotherapy may prevent participating in the B4DT.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Bergen Four-Day Treatment
Other: Bergen Four-Day Treatment (B4DT)
The intervention starts with a pre-assessment, during which patients' motivation, expectations, and willingness to engage in exposure practice are assessed. After the pre-assessment, patients participate in a four-day intensive treatment period based on exposure and response prevention. The intensive phase is an individualized intervention delivered within a group framework. This phase is followed by a three-month period of independent practice, with a couple of appointments with the therapist. Changes in patients' symptoms, daily functioning, and well-being are assessed. In addition, healthcare professionals' attitudes toward the intervention will be examined.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Yale-Brown Obsessive-Compulsive Scale, Self-Report (Y-BOCS-SR)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
Changes in OCD symptoms will be assessed using the Yale-Brown Obsessive-Compulsive Scale, Self-Report (Y-BOCS-SR), a ten-item self-report measure with each item rated from 0 to 4. Total scores range from 0 to 40, with higher scores indicating more severe symptoms.
From pre-assessment to the end of follow-up approximately four to six months.
Obsessive-Compulsive Inventory - Revised (OCI-R)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
In addition to the Y-BOCS, changes in OCD symptoms will be assessed using the Obsessive-Compulsive Inventory - Revised (OCI-R), which consists of 18 items, each rated from 0 to 4, with total scores ranging from 0 to 72 points. Higher scores indicate more severe symptoms.
From pre-assessment to the end of follow-up approximately four to six months.
Client Satisfaction Questionnaire (CSQ-8)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
Patients will be asked about their satisfaction with the treatment using the Client Satisfaction Questionnaire (CSQ-8). The CSQ-8 consists of eight items, each rated on a scale from 1 to 4, with total scores ranging from 8 to 32. Higher scores indicate greater satisfaction with the treatment.
From pre-assessment to the end of follow-up approximately four to six months.
Credibility and Expectancy Questionnaire (CEQ)
Time Frame: approximately four months
Patients' treatment expectations will be assessed using the Credibility and Expectancy Questionnaire (CEQ). The CEQ includes six items: four rated from 1 to 9 and two from 0% to 100%, with higher scores indicating greater expectations and confidence in the treatment.
approximately four months
Self-report for healthcare professionals (AIM, IAM, FIM)
Time Frame: approximately four months
The acceptability, appropriateness, and feasibility of the treatment will be assessed among healthcare professionals using a combination of three subscales: the Acceptability of Intervention Measure (AIM), Intervention Appropriateness Measure (IAM), and Feasibility of Intervention Measure (FIM). The AIM, IAM, and FIM each consist of four items rated on a five-point scale. Accordingly, the total score for each scale ranges from 4 to 20 points. The total 12-item score ranges from 12 to 60, with higher scores indicating greater overall treatment acceptability.
approximately four months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Patient Health Questionnaire (PHQ-9)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
Secondarily, the aim is to investigate whether there are changes in patients' depressive symptoms during the treatment. Depressive symptoms will be assessed using the Patient Health Questionnaire (PHQ-9), which consists of nine items, each rated from 0 to 3, with total scores ranging from 0 to 27. Higher scores indicate more severe depressive symptoms.
From pre-assessment to the end of follow-up approximately four to six months.
Generalized Anxiety Disorder Scale (GAD-7)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
In addition to depressive symptoms, the aim is to examine whether there are changes in patients' anxiety symptoms during the treatment. Anxiety symptoms will be assessed using the Generalized Anxiety Disorder Scale (GAD-7), which consists of seven items scored from 0 to 3, with total scores ranging from 0 to 21. Higher scores indicate more severe anxiety symptoms.
From pre-assessment to the end of follow-up approximately four to six months.
Work and Social Adjustment Scale (WSAS)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months
Work and social functioning will be assessed using the Work and Social Adjustment Scale (WSAS), a five-item measure rated on a Likert scale from 0 ("Not at all") to 8 ("Very much"). Total scores range from 0 to 40, with higher scores indicating greater impairment in work and social functioning.
From pre-assessment to the end of follow-up approximately four to six months
Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
General wellbeing will be assessed using the Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS), which consists of 14 items rated on a five-point Likert scale from 1 "Never" to 5 "All the time," yielding total scores from 14 to 70. Higher scores indicate higher perceived wellbeing.
From pre-assessment to the end of follow-up approximately four to six months.
EuroQol 5-Dimension Questionnaire (EQ-5D)
Time Frame: From pre-assessment to the end of follow-up approximately four to six months.
Quality of life will be assessed using the EuroQol 5-Dimension Questionnaire (EQ-5D), which consists of five items scored from 1 to 5, with total scores ranging from 5 to 25. Higher scores indicate lower perceived well-being. In addition, the EQ-5D includes a one-item scale for self-assessed well-being ranging from 0 to 100%. Higher percentages indicate higher perceived well-being.
From pre-assessment to the end of follow-up approximately four to six months.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Tampere University Hospital

Collaborators

Tampere University

Investigators

  • Principal Investigator: Aino Mattila, Tampere University Hospital

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

June 1, 2026

Primary Completion (Estimated)

December 1, 2027

Study Completion (Estimated)

December 1, 2027

Study Registration Dates

First Submitted

May 25, 2026

First Submitted That Met QC Criteria

June 11, 2026

First Posted (Actual)

June 12, 2026

Study Record Updates

Last Update Posted (Actual)

June 12, 2026

Last Update Submitted That Met QC Criteria

June 11, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • R26017

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

The information sheet for research participants in this study states that the study data will not be shared and will be available only to researchers working for the Wellbeing Services County of Pirkanmaa. Patients will provide written consent only for this specific use of their personal data. This procedure has been approved by the ethics committee.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Obsessive Compulsive Disorder (OCD)

Clinical Trials on Bergen Four-Day Treatment (B4DT)

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Macedonia

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

Subscribe