The number of school-aged children referred for psychological assessment and psychotherapy in our psychology clinic, who are showing comorbid emotional and behavioural issues, are in continuous growth over the last years. This article presents the correlations between the level of anxiety scales in school-aged children and their aggressive behaviour, and also a prediction equation for the children's aggressive behaviour. All the data are collected over the last 3 years in a centre for research, diagnosis and treatment of children with mental health issues in Romania.