Statistical analysis
BLIND
All statistical analyses were conducted using R. Study staff who conducted the analyses were blind to group assignment during pre-processing and analysis of all measures. Overall, there was less than 4% missing data in the entire dataset, which stem from missing data in the scales of BRIEF teachers and RS-EEG recordings, as well as missing daily treatment sessions. This was due to movement restrictions imposed during the COVID-19 pandemic, which affected arrivals to the lab and to schools. Before statistical testing, outlier data, defined as values 2.5 SDs above or below the group mean of each measure, were removed from further analyses [Demographic characteristics of age, gender, and estimated IQ (calculated based on the Vocabulary and Block Design dyad subscales of WISC as short-form IQ assessment [For our primary outcome measure (ADHD-RS), a simple model which included the main effects of stimulation and time with no interaction between them was preferred to a more complex model that included the interaction term (F(7) = 2.06, 