Cognitive Behavioral Group Therapy for Trichotillomania (Hair Pulling Disorder)

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Brief Title

Cognitive Behavioral Group Therapy for Trichotillomania (Hair Pulling Disorder)

Official Title

The Norwegian Trichotillomania Project

Brief Summary

      This study aims at evaluating the effectiveness of group-based cognitive behavioral therapy
      for trichotillomania at three clinical sites in Norway.

Detailed Description

      The Norwegian Trichotillomania Project is a multicenter study that aims at evaluating the
      effectiveness of behavioral group therapy for TTM, i.e., ACT (Acceptance and commitment
      therapy) enhanced habit reversal training (ACT-enhanced HRT).

      Participants are adults or adolescents (16 year or older) who fulfill criteria for TTM
      according to DSM-IV. Inclusion started in January 2013 and will be completed by Mai 2016.
      Treatment is delivered at three treatment sites in Norway; in Kristiansand, Oslo, and
      Trondheim. Treatment is manualized, following the manual of Twohig and Woods, and consists of
      ten group sessions of three hours delivered at consecutive weeks, and two or three booster
      sessions during the first year after treatment.

      Treatment outcome is evaluated by three outcome measures; the Massachusetts General Hospital
      - Hairpulling Scale (self-report); the National Institute of Mental Health Trichotillomania
      Severity Scale (clinical interview, conducted by independent evaluators); and the Clinical
      Global Impression Scale for TTM. Outcome is measured at three points in time; at baseline, at
      the end of treatment, and at one-year follow-up. Mixed models procedures in SPSS is used to
      analyze longitudinal data.

      The first paper will be written on patients admitted to treatment from January 2013 to
      September 2014, and includes 53 patients (49 women and four men). By January 2016, fifty-one
      patients (96%) had participated in the one-year follow-up evaluation.

Study Type


Primary Outcome

Change in National Institute of Mental Health Trichotillomania Severity Scale (NIMH-TSS)

Secondary Outcome

 Change Patient Health Questionnaire-9 (PHQ-9)




Cognitive behavioral therapy


* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline.

Recruitment Information

Recruitment Status


Estimated Enrollment


Start Date

January 2013

Completion Date

December 2019

Primary Completion Date

December 2016

Eligibility Criteria

        -  Inclusion Criteria:

               -  Clinical diagnosis of Trichotillomania

               -  Age between 16 and 67

          -  Exclusion Criteria:

               -  schizophrenia spectrum disorder

               -  substance addiction

               -  severe antisocial, schizotypal, or paranoid personality disorder

               -  severe eating disorder,

               -  ongoing suicidal ideation

               -  pervasive developmental disorder

               -  mental retardation and severe sequelae after brain injury.




16 Years - 67 Years

Accepts Healthy Volunteers



Benjamin Hummelen, Ph.D., M.D., , 

Administrative Informations



Organization ID


Responsible Party

Principal Investigator

Study Sponsor

Oslo University Hospital


 Sorlandet Hospital HF

Study Sponsor

Benjamin Hummelen, Ph.D., M.D., Principal Investigator, Oslo University Hospital, Oslo, Norway

Verification Date

April 2016