What question did this study set out to answer?

The aim is to understand how co-occurring internalizing difficulties and aggression in preschoolers affect mental health outcomes in adolescence, including the role of sex differences.

April 19, 2026International Journal of Behavioral DevelopmentOpen Access

Co-occurrence of internalizing difficulties and aggression in preschoolers and mental health outcomes in adolescence

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Authors

STStella TsotsiOsloMet – Oslo Metropolitan University RCRobert J. CoplanUniversity of Oslo NCNikolai O. CzajkowskiUniversity of Oslo

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Examines how internalizing difficulties and aggression affect adolescent mental health, indicating a need for early interventions.

Key Points

The aim is to understand how co-occurring internalizing difficulties and aggression in preschoolers affect mental health outcomes in adolescence, including the role of sex differences.
Analyzed data from the Norwegian Mother, Father and Child Cohort Study with mothers reporting on children's difficulties at age 5.
Classified children into four profiles based on their internalizing difficulties and aggression.
Assessed adolescents' mental health outcomes, including life satisfaction, prosocial skills, and various psychological difficulties at age 14.
Children in co-occurring profiles reported higher levels of depressive, anxiety, and psychosis-related difficulties in adolescence.
Primarily aggressive children showed higher rates of conduct-related issues and psychopathy compared to normative peers.
All at-risk groups reported lower life satisfaction, with primarily aggressive children exhibiting lower prosocial skills.

Cite This Study

Tsotsi et al. (2026) studied this question.

synapsesocial.com/papers/69e47321010ef96374d8f0b7 https://doi.org/10.1177/01650254261438685

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Co-occurrence of internalizing difficulties and aggression in preschoolers and mental health outcomes in adolescence

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Key Points

Cite This Study

Co-occurrence of internalizing difficulties and aggression in preschoolers and mental health outcomes in adolescence

Discussion

Member takes

Implication

Key Points

Cite This Study

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