Oppositional defiant disorder and conduct disorder are childhood and adolescent disorders, according to PsychCentral. Later in life, these disorders either go away or develop into different mental disorders, such as antisocial personality disorder. Some children who suffer from conduct disorder develop depression or bipolar disorder as adults, states Healthline.
The prognosis for children who develop conduct disorder is worse than for adolescents who develop the disorder. If symptoms of conduct disorder develop before the age of 10, it is more likely to persist, and the child is more likely to develop antisocial personality disorder as an adult, according to PsychCentral.
Oppositional defiant disorder is also a childhood and adolescent disorder. When a diagnosis is being considered for either conduct disorder or oppositional defiant disorder, it's important to rule out other possible explanations for the patient's behavior, such as a mood disorder or psychosis. Like conduct disorder, a portion of the children or teens who suffer from oppositional defiant disorder go on to develop antisocial personality disorder as adults, explains PsychCentral.
With greater severity and frequency of the symptoms, it becomes more likely that a youth suffering from conduct disorder develops antisocial personality disorder or psychopathy, a type of antisocial personality disorder, according to Healthline.