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Cassel Personality Disorder Study. Methodology and treatment effects
Summary
A two-stage treatment model combining inpatient and community care significantly improves mental health and social adjustment for personality disorder patients compared to purely inpatient treatment.
Area of Science:
- Psychiatry
- Clinical Psychology
- Mental Health Services Research
Background:
- Effectiveness of hospital-based personality disorder treatment models remains uncertain.
- Need for comparative studies on different treatment modalities.
Purpose of the Study:
- To compare the effectiveness of two psychosocial intervention models for personality disorder.
- Evaluate a one-stage (in-patient only) versus a two-stage (in-patient plus outreach) treatment model.
Main Methods:
- Prospective comparison of two personality disorder patient samples.
- One-stage model: in-patient treatment with no aftercare.
- Two-stage model: shorter in-patient admission followed by outreach therapy.
Main Results:
- The two-stage model showed significantly better outcomes on Global Assessment Score (GAS) at 6 and 12 months.
- Social Adjustment Scale (SAS) scores were significantly better at 12 months for the two-stage group.
- Reliable improvement rates favored the two-stage model (GAS: 43% vs. 17%; SAS: 39% vs. 15%).
- Borderline personality disorder (BPD) patients in the two-stage model showed greater improvement.
Conclusions:
- A long-term, phased model integrating hospital and community-based strategies is advantageous.
- The two-stage model offers superior outcomes compared to a purely in-patient approach for BPD treatment.