The following table shows statistically how likely it is that a person who is diagnosed with one personality disorder will also be diagnosed with another personality disorder, as defined by the American Psychiatric Association's Diagnostic & Statistical Manual of Mental Disorders (DSM-IV).

The numbers displayed in the table below are a statistical measures of co-occurrence known as "tetrachoric correlations". The more positive the number, the more likely it is that a person will be diagnosed with the second personality disorder listed. The more negative the number, the less likely it is that a person will be diagnosed with the second personality disorder in the table.

Note: This data was compiled from an initial survey of 5692 people in the US. None of the people in the survey sample were identified as meeting the criteria for Histrionic Personality Disorder or Narcissistic Personality Disorder. Therefore, no comorbidity information is shown for HPD or NPD.

Source: Lenzenweger et al, 2007 - DSM-IV personality disorders in the National Comorbidity Survey Replication