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Résumé (anglais)

EXECUTIVE SUMMARY Background: Very few studies have investigated the association between risk factors in late childhood and subtypes of conduct disorder (CD) in early adolescence that comprise such heterogeneous symptoms as aggression, destruction of property, theft and serious violations of rules. Previous research has identified four distinct subtypes: No CD type (82.4%), Non-Aggressive CD (NACD) type (13.9%), Physically Aggressive CD (PACD) type (2.3%) and Severe-Mixed CD (SMCD) type (1.4%). These subtypes suggest that there can be multiple pathways to CD that can have similar or different risk factors depend – ing on the qualitative or quantitative aspects of the CD profiles. The aim of the present study was to identify late childhood risk factors in multiple domains, such as neighbourhood characteristics, family adversity, parenting/peer relationships and externalized/internalized behaviours that are common and specific to the four CD subtypes. Methods: Data on CD symptoms and risk factors were collected using the National Longitudinal Survey of Children and Youth. Three cohorts of 12- and 13-year-olds were assessed during 1994-1995, 1996-1997 and 1998-1999 ( N = 4,125). Results: Bivariate analyses revealed that out of 12 risk factors, 10 were associated with SMCD, 9 were associated with PACD and 10 were associated with NACD. In contrast to No CD subtype, multivariate analyses revealed that older age, non-intact family, family mobility and hyperactivity/inattention were predictors of SMCD. Males in the younger age category with family mobility and high physical aggression were associated with PACD. NACD was characterized by males in the older age category and with non-intact family, family mobility, coercive/ineffective parenting and deviant peers. Conclusion: Although there are many subtypes of CD, our findings suggest that there is more commonality than differences in risk factors. Components of family adversity, parenting practices and hyperactivity/inattention should be the focus of prevention and intervention efforts.