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  • Print publication year: 2010
  • Online publication date: January 2018

15 - Outcome measures for people with personality disorders

from Part III - Symptom severity outcome measures
    • By Paul Moran, Health Service and Population Research Department, Institute of Psychiatry, King's College London, UK, Rohan Borschmann, clinical psychologist and research worker at the Institute of Psychiatry, King's College London, UK
  • Edited by Graham Thornicroft, Michelle Tansella
  • Publisher: Royal College of Psychiatrists
  • pp 251-265


Personality disorders are common conditions, associated with significant burden to the individual, those around him or her and society as a whole. This chapter first briefly examines the classification and epidemiology of personality disorders, before it goes on to review current research on outcome measures for personality disorders, the instruments used in their assessment and the outcome measures used in randomised controlled trials of interventions for borderline personality disorder.

Definition and classification of personality disorders

The concept of abnormal personality was recognised by many ancient cultures, including the Ancient Greeks, Chinese and the Celts, although the modern usage of the concept of ‘personality disorder’ can be traced to the eighteenth century (Tyrer et al, 1991).

The diagnostic features of all personality disorders are listed in Box 15.1. Although the clinical features of personality disorders describe characteristics that any individual may possess in varying degrees from time to time, it is the enduring, inflexible and dysfunctional nature of such personality traits that distinguishes those who have personality disorders from those who do not.

Box 15.1 Core diagnostic features of all personality disorders

• Maladaptive patterns of behaviour, thinking, emotions and perceptions.

• Enduring and pervasive disturbance that is not limited to episodes of mental illness.

• Considerable personal distress and/or significant problems in personal, occupational and/or social functioning.

• Early manifestations (e.g. conduct disorder) in childhood.

While ICD–10 (World Health Organization, 1992) continues to retain personality disorder within the main rubric of mental disorders, DSM has, since its third revision in 1980, placed personality disorders on a separate axis, Axis II (American Psychiatric Association, 1980). Table 15.1 lists the specific personality disorders classified by ICD–10 and DSM–IV (American Psychiatric Association, 1994). DSM–IV recognises three ‘clusters’ of personality disorder:

• cluster A (the ‘odd or eccentric’ types) – paranoid, schizoid and schizotypal personality disorder

• cluster B (the ‘dramatic, emotional or erratic’ types) – histrionic, narcissistic, antisocial and borderline personality disorders

• cluster C (the ‘anxious and fearful’ types) – obsessive–compulsive, avoidant and dependent.