The prevalence of personality disorder assessed by the Jamaica Personality Disorder Inventory (JPDI), the International Personality Disorder Examination Screening questionnaire (IPDE-S) and the consultant Diagnostic and Statistical Manual of Mental Disorders, fourth edition-text revision (DSM IV-TR) instruments in medical wards in Jamaica is significantly higher than the prevalence rate of studies in other countries. The prevalence rate identified by the IPDE-S was significantly higher that the local instruments used.

The correlates of the phenomenology of conflict, power and authority management in the Jamaican population of 1506 adult individuals were sampled from 2150 households using the 12 questions of the Jamaica Personality Disorder Inventory (JPDI). Nearly one third of the sample population studied reported problems with conflict, abnormal power and authority management, impulse control and serious aggressive and transgressive behaviour.