I had no idea what DBT group was so I looked it up.....
An Overview of Dialectical Behaviour Therapy in the Treatment of Borderline Personality Disorder
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by Barry Kiehn and Michaela Swales
Patients showing the features of Borderline Personality Disorder as defined in DSM-IV are notoriously difficult to treat (Linehan 1993a).
They are difficult to keep in therapy, frequently fail to respond to our therapeutic efforts and make considerable demands on the emotional resources of the therapist, particular when suicidal and parasuicidal behaviours are prominent. Dialectical Behaviour Therapy is an innovative method of treatment that has been developed specifically to treat this difficult group of patients in a way which is optimistic and which preserves the morale of the therapist. The technique has been devised by Marsha Linehan at the University of Washington in Seattle and its effectiveness has been demonstrated in a controlled study, the results of which will be summarised later in this paper.
BORDERLINE PERSONALITY DISORDER
Dialectical Behaviour Therapy is based on a bio-social theory of borderline personality disorder. Linehan hypothesises that the disorder is a consequence of an emotionally vulnerable individual growing up within a particular set of environmental circumstances which she refers to as the 'Invalidating Environment'.
An 'emotionally vulnerable' person in this sense is someone whose autonomic nervous system reacts excessively to relatively low levels of stress and takes longer than normal to return to baseline once the stress is removed. It is proposed that this is the consequence of a biological diathesis. (much much much more at link)
http://priory.com/dbt.htmWhat this says is that they are a special group designed to keep their therapists from killing them or committing suicide because they are so insane and needy. 