Reciprocal relations between interparental aggression and symptoms of oppositional defiant and conduct disorders: a seven‐wave cohort study of within‐family effects from preschool to adolescence.

Background: Interparental aggression is believed to increase the risk of behavioral disorders in offspring, and offspring behavioral problems may forecast interparental aggression. However, these assumptions have yet to be put to a strong test. This study, therefore, examined whether increased interparental aggression predicted increased symptoms of oppositional defiant disorder (ODD) and conduct disorder (CD) from preschool to adolescence and vice versa. Methods: A sample (n = 1,077; 49.6% girls) from two birth cohorts of children in Trondheim, Norway, was assessed biennially from age 4 to 16. Children's symptoms of ODD and CD were assessed using semi‐structured clinical interviews of parents (from age 4) and children (from age 8). One of the parents reported on their own and their partner's verbal and physical aggression. A random intercept cross‐lagged model was estimated to test the within‐family relations between interparental aggression, CD, and ODD symptoms. Results: Across development, increased interparental aggression predicted increased CD symptoms 2 years later, whereas an increased number of ODD symptoms forecasted increased interparental aggression. Conclusions: The argumentative/defiant, aggressive, and vindictive behaviors seen in ODD are often directed toward parents and may take a toll on their relationship and possibly foster interparental aggression, whereas aggression between parents may promote symptoms of CD in their offspring, which commonly extend beyond the home. Incorporating effective and non‐aggressive means to solve interparental conflict into parental management programs may reduce the development of symptoms of CDs in children. [ABSTRACT FROM AUTHOR]