Randomization
MH, autistic traits
Participants were allocated to either the intervention group (ACAT + TAU) or control group (TAU + waiting list to intervention) in a 1:1 ratio using the minimization method, based on gender (boy, girl, or other) and awareness of their autistic traits by the AKQ-Child (AKQ-C) (total score more or less than 2.4) at baseline. The randomization procedure was conducted by Chiba University Hospital’s independent data management team using a computer program. Participants allocated to the control group were informed that they could receive the ACAT program after this randomized controlled trial was completed. Therapists and participants were not blinded to their group assignment; however, two trained testers, MH and MS, who assessed only the AKQ-C and AKQ-Parent (AKQ-P), were blinded to the groups.