2.1.1. Data Set
The Adolescent Brain Cognitive Development (ABCD) study is the largest longitudinal study ongoing in the United States on brain development and child mental health (Garavan et al., 2018). At baseline, 11,880 participants aged 9-10, and their families, were recruited through schools. The ABCD study ensured that participants were representative of the U.S. population with regard to gender, ethnicity, education, income level, and living environment (Adolescent Brain Cognitive Development, 2024). The study has been designed to take place over 10 years, where every year participants are tested on multimodal assessments such as physical, social, emotional, environmental, behavioral, and neuroimaging measures.