Prevalence, comorbidity and predictors of anxiety disorders among children and adolescents.

•This study was conducted for the first time in Iran with a high sample size among children and adolescents.•Main comorbidities with anxiety disorders among children and adolescents were behavioral, elimination, and mood disorders.•History of psychiatric hospitalization of parents can predict anxiety disorders among children and adolescents.•The prevalence of anxiety among girls and boys was 15.1% and 13.2%, respectively.