AUTHOR=Ahmad Shaikh I. , Meza Jocelyn I. , Posserud Maj-Britt , Brevik Erlend J. , Hinshaw Stephen P. , Lundervold Astri J. 

TITLE=Attention-Deficit/Hyperactivity Disorder Symptom Dimensions Differentially Predict Adolescent Peer Problems: Findings From Two Longitudinal Studies

JOURNAL=Frontiers in Psychology

VOLUME=Volume 11 - 2020

YEAR=2021

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2020.609789

DOI=10.3389/fpsyg.2020.609789

ISSN=1664-1078

ABSTRACT=Introduction: Previous findings that inattention and hyperactive/impulsive symptoms predict later peer problems have been mixed. Utilizing two culturally diverse samples with shared methodologies, we assessed the predictive power of dimensionally measured childhood inattention and hyperactive/impulsive symptoms regarding adolescent peer relationships.
Methods: A US-based, clinical sample of 228 girls with and without childhood diagnosed attention-deficit/hyperactivity disorder (ADHD; M age = 9.5) was assessed and followed 5 years later. A Norwegian, population-based sample of 3467 children (53% girls; M age = 8.3) was assessed and followed 3 years later. Both investigations used parent and teacher reports of ADHD symptoms and peer relations. Multivariate regression analyses examined the independent contributions of inattention and hyperactive/impulsive symptoms to later peer problems, adjusting for baseline childhood peer problems. We also examined childhood sex as a potential moderator within the Norwegian sample. 
Results: Higher levels of childhood hyperactive/impulsive symptoms, but not inattention symptoms, independently predicted adolescent peer problems in the all-female clinical sample. Conversely, higher levels of inattention symptoms, but not hyperactive/impulsive symptoms, independently predicted preadolescent peer problems in the mixed-sex population sample. Results did not differ between informants (parent vs. teacher). Associations between ADHD symptom dimensions and peer problems within the Norwegian sample were not moderated by child sex. 
Discussion: Differential associations between childhood hyperactive/impulsive and inattention symptoms and adolescent peer problems were found across two diverse samples using a shared methodology. Potential explanations for different findings in the clinical vs. population samples include symptom severity as well as age, sex, and cultural factors. We discuss implications for future research, including the importance of dimensional measures of ADHD-related symptoms and the need for shared methodologies across clinical and normative samples.