In separate studies, DDP has been shown to improve symptoms of borderline personality disorder (BPD),
depression, and dissociation, to decrease use of hospitalization, to lessen maladaptive behaviors, such as suicide attempts, self-harm, and substance misuse, and to improve functioning. In a small, randomized controlled trial of DDP for co-occurring BPD and
alcohol use disorder, clients receiving DDP achieved significantly greater improvement in symptoms of BPD, depression, and social functioning than clients receiving community-based treatment of equal intensity. 90% of clients who completed 12 months of DDP achieved a clinically meaningful change in symptoms of BPD. Most participants continued to improve after treatment with DDP ended, with significant improvement noted in parasuicide behavior, heavy drinking and
recreational drug use. A study examining mechanisms of change indicated that therapist adherence to DDP techniques strongly predicted symptom improvement, thus suggesting specific therapeutic efficacy for DDP techniques. A case series of clients with co-occurring BPD and dissociative identity disorder indicated that DDP was associated with marked improvement in dissociative symptoms over 12 months. An observational study comparing naturalistic outcomes of DDP and
dialectical behavior therapy (DBT) in treatment refractory clients seen at a medical university clinic indicated significantly better improvement for clients treated with DDP than DBT across a broad range of outcomes, including symptoms of BPD, depression, disability, and self-harm. After an independent review by the U.S. government's
Substance Abuse and Mental Health Services Administration (SAMHSA), DDP was included on its (now defunct)
National Registry of Evidence-based Programs and Practices (NREPP) (see www.nrepp.samhsa.gov). ==References==