IRCT201207035280N8 IRCT 2012-09-25 Mashhad University of Medical Sciences The efficacy of developmental attachment-based play therapy on developmental trauma disorder symptoms in children from 3 to 9 years old The efficacy of developmental attachment-based play therapy on developmental trauma disorder symptoms in children from 3 to 9 years old 2009-05-22 anticipated 14 Complete https://irct.ir/trial/5634 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. N/A developmental trauma disorder symptoms. Intervention 1: Intervention group take part in 10 play therapy sessions. Intervention 2: Controls are on the waiting list for treatment. Also free play therapy sessions with supportive approach are conducted for controls to the end of study, then controls are removed from waiting list and treatment is begun for them based on families' desire.