Primary school students (817 apparently healthy 10-year olds) were screened by transthoracic 2-dimensional echocardiography to assess for the prevalence of bicuspid aortic valve. Bicuspid aortic valve was found in 0.5% of cases, with a higher prevalence in males than females (0.75% vs 0.24%), and was significantly associated with aortic root enlargement compared with children who had tricuspid aortic valves.