Conduct disorder and antisocial behaviour

Overview & Definition

Picture the ten-year-old who has been suspended twice for fighting, whose teacher describes cruelty to younger children at lunchtime, and whose mother — exhausted and frightened — tells you he steals from her purse and will not come home until midnight. The defining feature is not that he is "naughty" or even that he is angry; it is that his behaviour crosses a line into violating the rights of others or breaking major social rules, and that it does so persistently and outside the developmental norm. [4]

Conduct disorder is a behavioural syndrome, not a single broken circuit, and it sits at the severe end of the disruptive-behaviour spectrum that runs from ordinary boundary-testing, through oppositional defiant disorder, to frank rights-violating conduct. What makes it a disorder is the triad of persistence (at least twelve months, with at least one symptom in the past six months), pervasiveness (more than one setting, or clearly impairing), and severity (the rights of others or major norms are actually violated, not merely bent). [4]

The reason the definition matters in clinic is that it tells you where to look next. A child whose behaviour fits conduct disorder needs an assessment of risk to self and others, a search for comorbidity (especially ADHD, which is the commonest travelling partner, and trauma), a developmental history that places the child on the Moffitt taxonomy, and a plan that almost always begins with the family rather than the child alone. [1] [4]

References12Show ledgerHide ledger

1. [1]Moffitt TE Adolescence-limited and life-course-persistent antisocial behavior: a developmental taxonomy. Psychol Rev, 1993.PMID 8255953
2. [2]Scott S, Knapp M, Henderson J, Maughan B Financial cost of social exclusion: follow up study of antisocial children into adulthood. BMJ, 2001.PMID 11473907
3. [3]Erskine HE, Ferrari AJ, Polanczyk GV, et al. The global burden of conduct disorder and attention-deficit/hyperactivity disorder in 2010. J Child Psychol Psychiatry, 2014.PMID 24447211
4. [4]Burke JD, Loeber R, Birmaher B Oppositional defiant disorder and conduct disorder: a review of the past 10 years, part II. J Am Acad Child Adolesc Psychiatry, 2002.PMID 12410070
5. [5]Furlong M, McGilloway S, Bywater T, et al. Behavioural and cognitive-behavioural group-based parenting programmes for early-onset conduct problems in children aged 3 to 12 years. Cochrane Database Syst Rev, 2012.PMID 22336837
6. [6]Eyberg SM, Nelson MM, Boggs SR Evidence-based psychosocial treatments for children and adolescents with disruptive behavior. J Clin Child Adolesc Psychol, 2008.PMID 18444059
7. [7]Sanders MR, Markie-Dadds C, Tully LA, Bor W The triple P-positive parenting program: a comparison of enhanced, standard, and self-directed behavioral family intervention for parents of children with early onset conduct problems. J Consult Clin Psychol, 2000.PMID 10965638
8. [8]Kim-Cohen J, Caspi A, Moffitt TE, et al. Prior juvenile diagnoses in adults with mental disorder: developmental follow-back of a prospective-longitudinal cohort. Arch Gen Psychiatry, 2003.PMID 12860775
9. [9]Dretzke J, Davenport C, Frew E, et al. The effectiveness and cost-effectiveness of parent training/education programmes for the treatment of conduct disorder, including oppositional defiant disorder, in children. Health Technol Assess, 2005.PMID 16336845
10. [10]Kazdin AE Treatments for aggressive and antisocial children. Child Adolesc Psychiatr Clin N Am, 2000.PMID 11005009
11. [11]Goulter N, Hur YS, Jones DE, et al. Kindergarten conduct problems are associated with monetized outcomes in adolescence and adulthood. J Child Psychol Psychiatry, 2024.PMID 37257941
12. [12]McCabe G, Godwin JW, Rothenberg WA, et al. Fast Track Intervention Effects and Mechanisms of Action Through Established Adulthood. Prev Sci, 2025.PMID 39392546