The supplementary material consists of one Word document containing nine tables that provide detailed statistical results supporting the analyses presented in the main article. These tables include additional evidence relevant for understanding the reported results, although they were not included in the main manuscript due to space constraints. The main objective of this study is to examine how executive functions (EF) and emotion regulation (ER) differ by sex and diagnostic status (autism, ADHD, and co-occurring autism/ADHD) in children and adolescents. Additionally, the project aims to investigate how these differences influence the associations between EF and ER, providing insight into diagnosis-specific cognitive-emotional profiles and informing early identification and targeted interventions.