Early childhood internalizing problems, externalizing problems and their co-occurrence and (mal)adaptive functioning...

Area of Science:

• Developmental Psychology
• Child Psychiatry
• Longitudinal Studies

Background:

• Internalizing and externalizing problems in childhood are linked to individual functioning and often co-occur.
• Research on their combined effects and impact across diverse developmental domains is limited.
• Existing studies predominantly focus on maladaptive functioning.

Purpose of the Study:

• To investigate the prospective relationship between early childhood internalizing and externalizing problems and a wide spectrum of adaptive and maladaptive functioning in emerging adulthood.
• To examine the additive and interactive effects of these childhood problems on later life outcomes.
• To extend previous research by considering multiple developmental domains.

Main Methods:

• Utilized data from the Flemish Study on Parenting, Personality and Development.
• Collected parent-reported Child Behavior Checklist data on internalizing and externalizing problems for 374 children (ages 4-8).
• Assessed outcomes in emerging adulthood (ages 20-24) via self-reports 16 years later across psychological, social, work, physical health, and self-concept domains.

Main Results:

• Early externalizing problems were significantly associated with maladaptive psychological and social functioning in emerging adulthood.
• Externalizing problems also predicted lower self-reported satisfaction with general health.
• Early internalizing problems did not show direct associations with emerging adulthood outcomes, but their interaction with externalizing problems predicted aggressive behavior.

Conclusions:

• Early childhood externalizing problems have a significant long-term impact on both maladaptive and adaptive functioning across multiple domains over 16 years.
• Findings underscore the importance of early childhood interventions targeting externalizing behaviors.
• Results support the development of personalized interventions considering the interplay of internalizing and externalizing problems.