“…The diagnosis of ADHD was performed in agreement with recommendations of American Psychiatry Society guidelines 8 , in a three-step levels evaluation as follows; the first step was identification-at-school of children with a suspicion of ADHD by qualitative evaluation of teachers for their inattention and hyperactivity among the school population; the second was a screening conducted by means of the Diagnostic and Statistical Manual of Mental Disorders-IV-Text Revision (DSM-IV-R), and the scale of Evaluation Deficit of Attention and Hyperactivity (EDAH), searching for those children fulfilling criteria for inattentive and hyperactivity according to normative data; at last, the third step, comprised the semi-structured multidisciplinary interview by means of the Diagnostic Interview for Children and Adolescents (Chronbach's alpha score among interviewers of 0.65-1.00, and test-retest confidence values of 0.78-0.86) 9 , taking into account persistence of the disorder for a period .6 months of ADHD symptoms in at least two environments, such as school and home. The interview was performed by neurologist, psychiatrist, psychologist, and teachers-parents opinions 2,10,11 . We studied only children with intelligence quotients .90 (Wechsler intelligence scale for children).…”