Diagnostic Criteria
A. A repetitive and persistent pattern of behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated, as manifested by the presence of three (or more) of the following criteria in the past 12 months, with at least one criterion present in the past 6 months:
Aggression to people and animals
1. often bullies, threatens, or intimidates others
2. often initiates physical fights
3. has used a weapon that can cause serious physical harm to others (e.g., a bat, brick, broken bottle, knife, gun)
4. has been physically cruel to people
5. has been physically cruel to animals
6. has stolen while confronting a victim (e.g., mugging, purse snatching, extortion, armed robbery)
7. has forced someone into sexual activity
Destruction of property
8. has deliberately engaged in fire setting with the intention of causing serious damage
9. has deliberately destroyed others' property (other than by fire setting)
Deceitfulness or theft
10. has broken into someone else's house, building, or car
11. often lies to obtain goods or favors or to avoid obligations (i.e., "cons" others)
12. has stolen items of nontrivial value without confronting a victim (e.g., shoplifting, but without breaking and entering; forgery)
Serious violations of rules
13. often stays out at night despite parental prohibitions, beginning before age 13 years
14. has run away from home overnight at least twice while living in parental or parental surrogate home (or once without returning for a lengthy period)
15. is often truant from school, beginning before age 13 years
B. The disturbance in behavior causes clinically significant impairment in social, academic, or occupational functioning.
C. If the individual is age 18 years or older, criteria are not met for Antisocial Personality Disorder.
Specify type based on age at onset:
 Childhood-Onset Type: onset of at least one criterion characteristic of Conduct Disorder prior to age 10 years
 Adolescent-Onset Type: absence of any criteria characteristic of Conduct Disorder prior to age 10 years
Specify severity:
 Mild: few if any conduct problems in excess of those required to make the diagnosis and conduct problems cause only minor harm to others
 Moderate: number of conduct problems and effect on others intermediate between "mild" and "severe"
 Severe: many conduct problems in excess of those required to make the diagnosis or conduct problems cause considerable harm to others

Associated Features
 Learning Problem
 Depressed Mood
 Hyperactivity
 Addiction
 Dramatic/Erratic/Antisocial Personality

Differential Diagnosis
Oppositional Defiant Disorder; Attention-Deficit/Hyperactivity Disorder; Manic Episode; Adjustment Disorder; Child or Adolescent Antisocial Behavior; Antisocial Personality Disorder.

Women who smoke more than half-a-pack of cigarettes a day during pregnancy are significantly more likely to have a son with conduct disorder than mothers who did not smoke during pregnancy, report researchers from the University of Chicago Medical Center and the University of Pittsburgh in the July 1997 issue of Archives of General Psychiatry.

Approximately five percent of all children in the United States, ages 4-17, suffer from conduct disorder, which involves chronic, serious anti-social behavior problems. Symptoms include frequent and persistent lying, fire-setting, vandalism, physical cruelty, forcible sexual activity or stealing that begins much earlier than normal juvenile delinquency and is much more severe.