IRCT2016011826079N1 IRCT 2016-05-04 investigator Treatment of Attention Deficit / Hyperactivity disorder Effectiveness of mindfulness-based therapy on reducing Symptoms and increasing mindfulness in adolescents with Attention Deficit–Hyperactivity disorder 2013-09-23 anticipated 30 Complete https://irct.ir/trial/21711 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment, Other design features: Participants randomly assigned to experimental and control groups by putting names of all people in a dish and draw was conducted in a way . N/A Attention Deficit Hyperactivity disorder. Intervention 1: The type of intervention in experimental group was a psychological intervention as Mindfulness-based therapy Which was conducted in eight two-hours sessions. The experimental group during sessions In addition to getting to know the nature of the disorder and the effectiveness logic of intervention on reducing symptoms, they became aware of the mindfulness fundamental attitudes and how to strengthen it. In more sessions was paid to formal mindfulness such as breathing meditation and informal exercises such as eating with mindfulness. Intervention 2: The control group had no kind of intervention.