“…In addition to data from the ABCD 2.0 release, we used the ABCD reproducible matched samples 51 (ARMS), available in ABCD collection 3165, that divided individuals from the full behavioural sample (n = 11,572) into discovery (n = 5,786) and replication (n = 5,786) sets, which were matched across 9 variables: site location, age, sex, ethnicity, grade, highest level of parental education, handedness, combined family income, and prior exposure to anaesthesia. Family members (that is, sibling pairs, twins and triplets) were kept together in the same set and the two sets were matched to include equal numbers of single participants and family members.…”