Across studies in the US, prevalence rates for DSM-IV personality disorders range from 9%[8] to 11.2%.[9] One large-scale community study utilising a structured interview administered by trained lay interviewers obtained a prevalence rate for any personality disorder of 14.79%.[10] However, in the second wave of this study, with stricter criteria applied regarding level of distress or impairment, prevalence rate for any personality disorder was 9.1%.[11] Schizoid personality disorder was found to be more common in men, with schizotypal personality disorder diagnosed equally between men and women.[11] Antisocial personality disorder is more prevalent among men than women;[10][12] men were also found to have higher rates of disorders in clusters A (odd/eccentric) and B (dramatic) when compared with women.[8] Prevalence of antisocial personality disorder appears to decline with increasing age.[8][12] This is seen across most other personality disorders,[10] with the exception of avoidant personality disorder.[10] One longitudinal study demonstrated that prevalence rates declined between ages 22 and 33.[9] European studies have found comparable prevalence rates,[13][14] and higher prevalence rates of cluster B disorders in the younger age group.[14] Prevalence rates for the various clusters range from 1.5% for cluster B to 6.0% for cluster C.[12] Research is limited and inconsistent in terms of differential prevalence rates between various ethnic groups.[10][12] Application of the impairment criteria prevalence rates for having any personality disorder were found to range from 5.31% for Asian/Native Hawaiian/other Pacific Islander, non-Hispanic people to 17.37% for American Indian/Alaska Native, non-Hispanic people.[11] A review of 15 studies (with 5 considered to be high quality) concluded that prevalence of personality disorder is lower among African-Americans versus white people, and that limited data preclude further conclusions.[15]

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