Attachment predicts changes in the level of personality functioning after psychotherapeutic inpatient treatment

Objectives: The relationship between patients' attachment strategies and the effectiveness of psychotherapy is empirically well established. However, studies on outcome measures other than symptomatic change are mostly lacking. The present study investigates if attachment anxiety and avoidance predict changes in personality functioning at the end of inpatient psychotherapy. Method: In two independent samples (the first sample consisting of N = 967 diagnostically heterogeneous patients, Fachklinikum Tiefenbrunn, and the second sample comprising N = 344 patients with personality impairments, Rehaklinik Bad Gronenbach), personality functioning was assessed by means of the short version of the OPD structure questionnaire OPD-SQS (OPD-Strukturfragebogen 12-Item-Screening version, OPD-SFK) at admission and discharge in a naturalistic study design. Data on the Brief Symptom Inventory (BSI) and the Inventory of Interpersonal Problems (IIP-32) were evaluated as additional outcome measures in the first sample. Patients' attachment strategies were assessed at admission using the German short version of the Experiences in Close Relationships (ECR-RD 12). Results: Attachment avoidance at baseline was inversely associated with improvements in personality functioning, psychopathology, and interpersonal problems. In the sample of patients diagnosed with personality disorders (sample 2), we found a negative association between attachment anxiety and improvements in the ability to make contact with others. Conclusions: Considering the limitations, our results underline the relevance of attachment for the treatment outcome of inpatient psychotherapy. The assessment of patient's attachment strategy as part of standardized diagnostics can be helpful in clinical practice regarding prognosis, therapy planning as well as the adjustment of the therapeutic relationship while treating patients suffering from impairments in personality functioning.