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Conduct Disorder: Biological Factors

Conduct disorder (CD), as defined in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5), and the International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10), is a repetitive and persistent pattern of dissocial, aggressive, and defiant behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated. CD may occur as early as age 5 or 6 years, but more commonly occurs in late childhood or early adolescence. The onset of CD after the age of 16 years is rare; however, CD may be diagnosed in individuals who are older than 18 years if the conditions for antisocial personality disorder are not met.

Behavior patterns associated with CD may be exhibited at home, ...

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