The borderline pattern descriptor in the International Classification of Diseases, 11th Revision: A redundant addition to classification.

OBJECTIVE: The International Classification of Diseases, 11th Revision classification of personality disorder removes all categories of disorder in favour of a single diagnostic spectrum extending from no personality dysfunction to severe personality disorder. Following concerns from some clinicians and Personality Disorder Societies, it was subsequently agreed to include a borderline pattern descriptor as a qualifier of the main diagnosis. We explore the value of this additional descriptor by examining personality data in patients with major depression. METHOD: We examined personality data obtained using the Structured Clinical Interview for Personality Disorder-II in 606 patients enrolled in five randomised controlled trials of depression. The Structured Clinical Interview for Personality Disorder-II uses the Diagnostic and Statistical Manual of Mental Disorders categorical system, which includes borderline personality disorder. The International Classification of Diseases, 11th Revision classification has five domain traits. Each of the Diagnostic and Statistical Manual of Mental Disorders personality disorder symptoms or behaviours from Structured Clinical Interview for Personality Disorder-II was reordered into the five domains independently by two assessors. The relationship between the two systems was examined by tabular and correlational analysis. RESULTS: The findings showed that the symptoms of borderline personality disorder were associated with greater severity of personality disturbance in the International Classification of Diseases, 11th Revision classification (p < 0.0001) and were associated primarily with the Negative Affective, Dissocial and Disinhibited domains. There was only a weak association with the other two domains, Anankastia and Detachment. CONCLUSION: The addition of a borderline pattern descriptor is likely to add little to the International Classification of Diseases, 11th Revision classification of personality disorder. Its features are well represented within the severity/domain structure, which allows for more fine-grained description of the personality features that constitute the borderline concept.