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Active, not recruitingNCT06548893Updated Aug 12, 2024

Acceptance and Commitment Therapy (ACT) in Groups for Obsessive Compulsive Disorder: A Clinical Trial in Brazil

An interventional study of Group acceptance and commitment therapy (ACT) in Obsessive-Compulsive Disorder, sponsored by Universidade Federal do Paraná. Active, not recruiting at 1 site in Brazil. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2024-08-12.

Sponsored by Universidade Federal do Paraná · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Primary completion was expected by Jun 2025, 1 year 4 months ago, but the record still lists the study as active, not recruiting.
  • Registered 1 year 11 months after the study started (first participant enrolled Aug 2022, registered Aug 2024).
Phase
Not applicable
Study type
Interventional
Enrollment
24
Allocation
Randomized
Ages
18 Years and older
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-12

Among 17 studies in Obsessive-Compulsive Disorder with a site in Brazil — 2 open to participants now, 3 under way, none of them phase 3. Obsessive-Compulsive Disorder · Brazil.

Planned enrollment
13th of 17
24 · median 40
Started
2022
with 1 other
No phase
8 of 17
2 open now
Registered
16th of 17
by date
Lead sponsor
1 of 17
Universidade Federal do Paraná

Among the 17 studies in Obsessive-Compulsive Disorder with a site in Brazil, this one is the 13th largest by planned enrollment, is one of 2 that started in 2022, is one of 8 with no phase, and was the 16th registered.

Obsessive-Compulsive Disorder

635 studies on the registry are indexed under Obsessive-Compulsive Disorder; 166 are open to participants now.

Browse Obsessive-Compulsive Disorder studies →

Open to participants now

2 of the 17 studies in Obsessive-Compulsive Disorder with a site in Brazil are open now. Recruiting first, the newest first:

All 2 open studies →

A study can be open while its sites in Brazil have not opened yet or have stopped. Only those recruiting at a site in Brazil →

Who these studies take

Of the 120 Obsessive-Compulsive Disorder studies recruiting now, 31 (26%) set no upper age limit and 81 (68%) stop at 75 or younger; 28 take children under 18; 18 take healthy volunteers.

This study: 18 Years and older · all sexes · no healthy volunteers.

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02

Study summary

The goal of this clinical trial is to learn if Acceptance and Commitment Therapy (ACT) + Exposure and Response Prevention (ERP) in Group is effective to Obsessive Compulsive Disorder (OCD) in adults.

Researchers will compare intervention to control group to see if those who attend the group therapy have better results than control group.

Participants will go through a 16-week group therapy based on a protocol designed by Michael Twohig (Twohig et al, 2018).

  • Participants will not have any medication adjustment during therapy
  • Participants will be assessed 3 times throughout the therapy, plus an assessment in a 6-month follow-up.
Read the detailed description

The goal of this clinical trial is to learn if Acceptance and Commitment Therapy (ACT) + Exposure and Response Prevention (ERP) in Group is effective to Obsessive Compulsive Disorder (OCD) in adults. The main questions it aims to answer are:

  • Can ACT in groups help decrease the severity of OCD symptoms?
  • Can ACT in groups help increase psychological flexibility in this group?
  • Can ACT in groups help increase quality of life in this group?

Researchers will compare intervention (n=16) to control group (n=8) to see if those who attend the group therapy have better results than control group.

We will perform an unequal randomization in a 2:1 ratio, in blocks of 6, for allocation to each group. The assessor of the outcomes of interest will be blinded to the group to which the participant was assigned

Participants will go through a 16-week group therapy based on a protocol designed by Michael Twohig (Twohig et al, 2018).

  • Participants will not have any medication adjustment during therapy
  • Participants will be assessed 3 times throughout the therapy, plus an assessment in a 6-month follow-up.
03

Conditions studied

  • Obsessive-Compulsive Disorder

Keywords

  • OCD
  • Obsessive-compulsive disorder
04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • OCD diagnosis according to DMS-5/ Minimum score of 20 in YBOCS

Exclusion criteria

Exclusion Criteria:

  • Psychotic disorder, maniac episode, intellectual disability, Chemical dependency, Suicidal risk, another current psychotherapy
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Outcomes assessor)
Enrollment
24 participants (estimated)

Study arms

  • Experimental
    Group psychotherapy with ACT

    16 sessions of group psychotherapy based on ACT + exposure with response prevention (EPR)

    Other: Group acceptance and commitment therapy (ACT)

  • No intervention
    Treatment as usual

    Patients will follow their usual treatment, without adding ACT-based group psychotherapy

Interventions

  • OtherGroup acceptance and commitment therapy (ACT)

    Group psychotherapy based on ACT + EPR

    Also known as: Group Psychotherapy, Acceptance and Commitment Therapy, Psychotherapy

06

What researchers measure

Primary outcomes

  1. Yale-Brown Obsessive-Compulsive Scale (YBOCS)

    Measure for assessing the presence and severity of obsessive-compulsive disorder (OCD) symptoms.

    Time frame: 10 months (4-month intervention + 6-month follow-up)

Secondary outcomes

  1. Acceptance and Commitment Therapy Processes (CompACT)

    Measure of psychological flexibility

    Time frame: 10 months (4-month intervention + 6-month follow-up)

  2. Quality of Life Enjoyment and Satisfaction Questionnaire (Q-LES-SV)

    Measures of the degree of enjoyment and satisfaction experienced by subjects in various areas of dally functioning

    Time frame: 10 months (4-month intervention + 6-month follow-up)

  3. Depression Anxiety and Stress Scale (DASS)

    Set of self-report scales designed to measure the emotional states of depression, anxiety and stress.

    Time frame: 10 months (4-month intervention + 6-month follow-up)

  4. AAQ for Obsessions and Compulsions (AAQ-OC)

    Self-report measure of experiential avoidance in response to unwanted intrusive thoughts.

    Time frame: 10 months (4-month intervention + 6-month follow-up)

  5. Affective Style Questionnaire (ASQ)

    Brief instrument to measure individual differences in emotion regulation

    Time frame: 10 months (4-month intervention + 6-month follow-up)

  6. Clinical Global Impressions (CGI) Scale,

    Quantify and track patient progress and treatment response over time.

    Time frame: 10 months (4-month intervention + 6-month follow-up)

07

Study locations

1 site
08

References and documents

Publications

  • Twohig MP, Abramowitz JS, Smith BM, Fabricant LE, Jacoby RJ, Morrison KL, Bluett EJ, Reuman L, Blakey SM, Ledermann T. Adding acceptance and commitment therapy to exposure and response prevention for obsessive-compulsive disorder: A randomized controlled trial. Behav Res Ther. 2018 Sep;108:1-9. doi: 10.1016/j.brat.2018.06.005. Epub 2018 Jun 22. PubMed 29966992 ↗

Individual participant data

Plan to share: No

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Aug 2022 (actual). Primary completion is estimated for Jun 2025, 34 months after the start.

Of 234 non-industry interventional studies with no phase under Obsessive-Compulsive Disorder, half reached primary completion within 43 months of starting (the median), counting those still running; a quarter within 22 and three quarters within 65. This study's planned 34 months is below that.

Counting every sponsor, half of 237 studies reached it within 43 months; a quarter within 22 and three quarters within 65.

How these figures are worked out, and which studies are left out of them.

Registered
Aug 8, 2024
First posted
Aug 12, 2024
StartActual
Aug 10, 2022
Primary completionEst.
Jun 20, 2025
CompletionEst.
Jun 20, 2026
Last update
Aug 12, 2024
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Aug 12, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06548893
Lead sponsor
Universidade Federal do Paraná
Responsible party
Luciana Midori Samezima (Ms, Universidade Federal do Paraná) — Principal investigator
First posted
Aug 12, 2024
Start date
Aug 10, 2022
Primary completion
Jun 20, 2025 (estimated)
Completion
Jun 20, 2026 (estimated)
Last update
Aug 12, 2024

Study contacts

Gabriela M Ferreira, MD, PhD
principal investigator · Universidade Federal do Paraná

Oversight

Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is active, not recruiting, as verified in Aug 2024. You cannot join it, but the record below documents what was studied.

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