Study design and participants
Psychiatric, QET‐based, ADHD
The study was designed as a randomized double‐blind controlled trial. Forty‐eight children were recruited from 11 mainstream schools. The children met two inclusive criteria—the age of 9–12 years and the diagnostic criteria for the inattentive and combined type of ADHD according to DSM‐5 (American Psychiatric Association [APA], The participants were randomly divided into two groups. The QET group, Written informed consent from the legal guardians of all the children we obtained to participate in the intervention program focused on reducing attention problems. Ethical approval for the study was obtained from the Institutional Review Board (code 31/2018). The participating children, their legal guardians, the testers, and the instructors of the QET‐based intervention were not aware of the aim of the study.Each participant attended a pre‐measurement (first week) and post‐measurement (seventh week). These measurements incorporated three neuropsychological tests (see below). From the second to the sixth week, the QET group underwent QET, one lesson per week, that is, a total of five lessons. The individuals in the CON group did not participate in any specific training/intervention on cognitive/executive functions during the 6‐week pre–post interval.