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Anxiety DisordersKOMMANCT05942391

Brief-intensive CBT Versus Once-weekly CBT in Anxiety-related Disorders

A study testing Cognitive behavioral therapy (CBT) in people with Anxiety Disorders and Obsessive-Compulsive Disorder, run by Amsterdam UMC, location VUmc at 6 sites in Netherlands.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

The goal of this clinical trial is to compare brief-intensive cognitive-behaviour therapy (CBT) with regular weekly CBT in people with anxiety-related disorders. The main question to answer is: will brief-intensive CBT improve functioning (work, family, social) more and faster than does regular weekly CBT?… Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
Cognitive behavioral therapy (CBT)
Could I receive a placebo?
No, everyone receives an active treatment
How many people
120 participants
Where
6 sitesNetherlands
Study dates
26 Apr 2024to May 2027
Phase
Interventional
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Age 18 years or older;
  • Reaching out for mental health care for one of the following disorders:
  • panic disorder, agoraphobia, generalised anxiety disorder, social anxiety disorder, posttraumatic stress disorder, obsessive-compulsive disorder, health anxiety disorder.

Who cannot join

  • Is in need of emergency mental health care
  • Has insufficient language skills in Dutch
  • Has evident cognitive limitations
  • Has had changes in the use of medication during the last 3 months.

Trial locations and contacts

6 sites in 1 country.

6 sites in 1 country

Netherlands6 sites
  • GGZ inGeest, polikliniek Angst & Dwang, locatie Amstelmere

    Amstelveen

  • GGZ inGeest, polikliniek Angst & Dwang, locatie De Nieuwe Valerius

    Amsterdam

  • GGZ inGeest, polikliniek Angst & Dwang, locatie Zuiderpoort

    Haarlem

  • GGZ Centraal, Algemeen Specialistische Polikliniek

    Hilversum

  • GGZ inGeest, polikliniek Angst & Dwang, locatie Spaarnepoort

    Hoofddorp

  • Altrecht Academisch Angstcentrum

    Utrecht

Other trials in Netherlands

About this study

Official title: Fast Recovery From Anxiety-related Disorders: Brief-intensive CBT Versus Once-weekly CBT

The goal of this clinical trial is to compare brief-intensive cognitive-behaviour therapy (CBT) with regular weekly CBT in people with anxiety-related disorders.

The main question to answer is: will brief-intensive CBT improve functioning (work, family, social) more and faster than does regular weekly CBT?

Participants will be asked to follow CBT treatment (20 sessions of 45 minutes in both conditions), and participate in 7 measurements with a total duration of 5 hours over 1 year.

Researchers will compare:

  • Brief-intensive CBT: 16 sessions in 2 weeks + 4 follow-up sessions within 3 months
  • Regular CBT with 20 weekly sessions in 6 months
Read the detailed description

Rationale: Anxiety-related disorders (i.e., obsessive compulsive, health anxiety and trauma disorders) affect about 10% of the adults. Though clinically heterogeneous, transdiagnostic aspects are expected disasters, anxiety and avoidance. Profound impairments include work and family functioning. Many enter a vicious circle with comorbidity and further decline in quality of life. Hence, the impact on functioning is tremendous, with anxiety-related disorders rating highest on disability rankings in the age 15-64 years. Cognitive behavioral therapy (CBT) is the preferred and often only psychotherapy for these disorders. Because guidelines are based on weekly sessions, recovery takes half a year at least. Based on initial research findings, we expect faster recovery by providing CBT in a brief-intensive format (BI-CBT), with clear benefts for patients, families and society. Some institutions already provide BI-CBT. However, evidence to justify this or to further implement BI-CBT is insufficient.

Study design: a parallel-group randomised controlled multicenter intervention study.

Study population: Adults aged 18-65 yr old with an anxiety-related disorder (panic, agrophobia, social anxiety, generalised anxiety obsessions/compulsions, health anxiety and post-traumatic stress)

Intervention (if applicable): One group receives BI-CBT (16 sessions in 2 weeks + 4 follow up sessions) and the other group receives 20 weekly CBT sessions. Treatment in both conditions can be personalised by a focus on work or family functioning.

Main study parameters/endpoints: The main study parameter is the 'area under the curve' for 6-month health and disability. Also, 1 year efficacy (both on functioning and symptom-level), cost-effectiveness, and feasibility will be assessed. Potential predictors of treatment preference, efficacy and drop-out will be explored.

All patients are expected to follow CBT (20 sessions of 45min) and participate in 7 measurements over 1 year.

The general measurements are online questionnaires and interviews by telephone, asking about someones functioning, quality of life and symptoms of anxiety or depression, how one copes with these and what one expects of the therapy.

The acronym KOMMA is based on the Dutch translation of 'to put a quick end to anxiety': Korte Metten Met Angst.

Being tested
Cognitive behavioral therapy (CBT)
Keywords
agoraphobia, social anxiety disorder, generalized anxiety disorder, panic disorder, trauma, health anxiety, obsessive compulsive disorder, CBT
Medical subject headings
Anxiety Disorders, Obsessive-Compulsive Disorder, Stress Disorders, Post-Traumatic, Hypochondriasis, Agoraphobia, Phobia, Social, Generalized Anxiety Disorder, Panic Disorder

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Cognitive behavioral therapy (CBT)Behavioural

    Also called exposure therapy

    The intervention is brief-intensive, guided exposure therapy and consists of 16 sessions exposure therapy, spread over 4 half-days in 2 weeks plus 4 follow-up sessions within 3 months.

Study groups in NCT05942391
Study groupRoleWhat they receive
Brief-Intensive CBTExperimental16 sessions in 2 weeks + 4 follow up sessions. The CBT consists of 16 sessions exposure therapy, spread over 4 half-days in 2 weeks, + 4 sessions within 3 months.
Receives: Behavioral: Cognitive behavioral therapy (CBT)
weekly CBTActive comparator20 weekly CBT sessions within 5 to 6 months. The CBT consists of exposure therapy.
Receives: Behavioral: Cognitive behavioral therapy (CBT)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Area Under the health and disability Curve at 6 months

    The 'area under the curve' for health and disability is based on the 36-item self-report World Health Organisation Disability Assessment Schedule (WHODAS 2.0). The WHODAS 2.0 captures the level of functioning in six domains of life: Cognition, Mobility, Self-care, Getting along, Life activities, Participation. Possible total scores of the items across all domains range 0 - 100. Lower scores indicate less disability.

    Measured: baseline, 2 weeks, 4 weeks, 2 months, 3 months, 6 months

Secondary outcomes (17)
  1. Area Under the health and disability Curve at 12 months

    The 'area under the curve' for health and disability is based on the 36-item self-report World Health Organisation Disability Assessment Schedule (WHODAS 2.0). The WHODAS 2.0 captures the level of functioning in six domains of life: Cognition, Mobility, Self-care, Getting along, Life activities, Participation. Possible total scores of the items across all domains range 0 - 100. Lower scores indicate less disability.

    Measured: baseline, 2 weeks, 4 weeks, 2 months, 3 months, 6 months, 12 months

  2. Change from baseline in severity of anxiety symptoms at post-treatment

    Severity of anxiety-related disorder, measured with the following disorder-specific severity questionnaires: the 24-item Liebowitz Social Anxiety Scale self-report version, the 7-item Panic Disorder Severity Scale self-report version, the 28-item Mobility Inventory, the 16-item Penn State Worry Questionnaire, the 10-item Yale-Brown Obsessive Compulsive Scale self-report version, the 20-item PTSD checklist for the DSM-5, or the 14-item Whitely Index. Higher scores indicate higher symptom severity. Z-scores will be calculated from individual scores for group-level analyses.

    Measured: baseline and 3 or 6 months

  3. Change from baseline in severity of anxiety symptoms at 3 months

    Severity of anxiety-related disorder, measured with the following disorder-specific severity questionnaires: the 24-item Liebowitz Social Anxiety Scale self-report version, the 7-item Panic Disorder Severity Scale self-report version, the 15-item Fear Questionnaire, the 16-item Penn State Worry Questionnaire, the 10-item Yale-Brown Obsessive Compulsive Scale self-report version, the 20-item PTSD checklist for the DSM-5, or the 14-item Whitely Index. Higher scores indicate higher symptom severity. Z-scores will be calculated from individual scores for group-level analyses.

    Measured: baseline and 3 months

  4. Change from baseline in severity of anxiety symptoms at 12 months

    Severity of anxiety-related disorder, measured with the following disorder-specific severity questionnaires: the 24-item Liebowitz Social Anxiety Scale self-report version, the 7-item Panic Disorder Severity Scale self-report version, the 28-item Mobility Inventory, the 16-item Penn State Worry Questionnaire, the 10-item Yale-Brown Obsessive Compulsive Scale self-report version, the 20-item PTSD checklist for the DSM-5, or the 14-item Whitely Index. Higher scores indicate higher symptom severity. Z-scores will be calculated from individual scores for group-level analyses.

    Measured: baseline and 12 months

  5. Change from baseline in severity of depressive symptoms at post-treatment

    Severity of depressive symptoms are measured with the 30-item Inventory for Depressive Symptomatology self-report questionnaire. Higher scores indicate higher symptom severity.

    Measured: baseline and 3 or 6 months

  6. Change from baseline in severity of depressive symptoms at 3 months

    Severity of depressive symptoms are measured with the 30-item Inventory for Depressive Symptomatology self-report questionnaire. Higher scores indicate higher symptom severity.

    Measured: baseline and 3 months

  7. Change from baseline in severity of depressive symptoms at 12 months

    Severity of depressive symptoms are measured with the 30-item Inventory for Depressive Symptomatology self-report questionnaire. Higher scores indicate higher symptom severity.

    Measured: baseline and 12 months

  8. Remission rates from anxiety-related disorder at post-treatment

    Remission of diagnoses of anxiety-related disorders is assessed using the Mini International Neuropsychiatric Interview - Simplified for DSM-5, Dutch version 1.1 (Overbeek \& Schruers, 2019).

    Measured: 3 or 6 months

  9. Remission rates from anxiety-related disorder at 12 months

    Remission of diagnoses of anxiety-related disorders is assessed using the Mini International Neuropsychiatric Interview - Simplified for DSM-5, Dutch version 1.1 (Overbeek \& Schruers, 2019).

    Measured: 12 months

  10. New-onset anxiety-related or depressive disorder post-treatment

    The new onset of anxiety-related or depressive disorder between baseline and post-treatment is assessed using the Mini International Neuropsychiatric Interview - Simplified for DSM-5, Dutch version 1.1 (Overbeek \& Schruers, 2019)

    Measured: baseline, 3 or 6 months

  11. New-onset anxiety-related or depressive disorder at 12 months

    The new onset of anxiety-related or depressive disorder between baseline and post-treatment is assessed using the Mini International Neuropsychiatric Interview - Simplified for DSM-5, Dutch version 1.1 (Overbeek \& Schruers, 2019)

    Measured: 12 months

  12. Productivity costs over 12 months

    Productivity losses are assessed using the iMTA Productivity Cost Questionnaire (iPCQ). The iPCQ is a 12-item self-report questionnaire including three modules measuring productivity losses of paid work due to 1) absenteeism and 2) presenteeism and productivity losses related to 3) unpaid work in the past 3 months.

    Measured: 3months, 6months, 12 months

  13. Medical costs over 12 months

    Medical costs from a mental health care perspective are assessed using the iMTA Medical Cost Questionnaire (iMCQ). The iMCQ is a 23-item self-report questionnaire, which apart from some general questions include questions on medical consumption from different healthcare providers in the past 3 months.

    Measured: 3months, 6months, 12 months

  14. Change from baseline in health-related quality of life over 12 months

    Quality of life is measured using the EQ-5D-5L. The EQ-5D-5L scores (reflecting the level of perceived problems on the dimensions of mobility, self-care, usual activities, pain/discomfort and anxiety/depression) are used to calculate utilities using the Dutch tariff. Quality Adjusted Life Years are calculated using linear interpolation between time points. Higher QALY scores indicate more improvement in quality of life.

    Measured: baseline, 2 weeks, 4 weeks, 2 months, 3 months, 6 months, 12 months

  15. Drop-out rates at post-treatment

    Percentage of patiënts who missed more than 25% of CBT sessions.

    Measured: 3 or 6 months

  16. Patient satisfaction at post-treatment

    The 8-item Client Satisfaction Questionnaire (CSQ-8) measures overall satisfaction of the patient with health and human services. Each item on the CSQ-8 is scored from 1 (low satisfaction) to 4 (high satisfaction), possible total scores ranging 8-32.

    Measured: 3 or 6 months

  17. Negative effects of psychotherapy

    The 21-item Inventory for the Assessment of Negative Effects of Psychotherapy (INEP) is a self-report instrument for assessing negative effects of psychotherapy from the patient's perspective. The negative effects cover 7 domains: Intrapersonal Change, Intimate Relationships, Stigmatization, Emotions, Workplace, Family and Friends, and Therapeutic Malpractice. The INEP items are answered using a 4-stage response format (0 = "disagree/not applicable"; 3 = "fully agree").

    Measured: 3 or 6 months

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted12 Jul 2023
  2. Study start26 Apr 2024
  3. Primary completionNov 2026 (estimated)
  4. Study completionMay 2027 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Model description
a parallel-group randomised controlled intervention study
Masking
Single blind
Who is masked
Outcomes assessor
Enrolment
120 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05942391
Sponsor's protocol ID
DR2022-00396
Acronym
KOMMA
Status last verified
May 2026
First submitted
16 Jun 2023
Last updated
29 May 2026
Results posted
No
Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A study testing Cognitive behavioral therapy (CBT) in people with Anxiety Disorders and Obsessive-Compulsive Disorder, run by Amsterdam UMC, location VUmc at 6 sites in Netherlands.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 29 May 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 6 sites in Netherlands. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Area Under the health and disability Curve at 6 months (time frame: baseline, 2 weeks, 4 weeks, 2 months, 3 months, 6 months). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 May 2026.

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