According to one aspect, there is provided a method for assessing the treatment of attention-deficit/hyperactivity disorder (ADHD) in a subject, the method comprising: obtaining electroencephalographic (EEG) data relating to a plurality of subjects diagnosed with ADHD extracting, for each of the plurality of subjects, at least one feature from the EEG data relating to that subject formulating a prediction model by performing regression analysis to map the extracted features against one or more markers for each of the plurality of subjects and determining that the prediction model provides an ADHD assessment if one or more of the markers are indicators of a clinical measure of interest.
