A behavior disorder developed by a small percentage of children with conduct disorder whose behavior does not improve as they mature. Also known as sociopathy or psychopathy.

About 3% of males and 1% of females develop antisocial personality disorder, which is essentially the adult version of childhood conduct disorder. Antisocial personality disorder is only diagnosed in people over age 18, the symptoms are similar to those of conduct disorder, and the criteria for diagnosis include the onset of conduct disorder before the age of 15. According to the Diagnostic and Statistical Manual of Mental Disorders (DSM- IV), people with antisocial personality disorder demonstrate a pattern of antisocial behavior since age 15.

The adult with antisocial personality disorder displays at least three of the following behaviors:

Fails to conform to social norms, as indicated by frequently performing illegal acts, and pursuing illegal occupations.

Is deceitful and manipulative of others, often...