**4.1 Demographics and risk factors**

Children of all ages (range 3 months - 18 years) have been identified with SSEH [18]. There does not appear to be a gender relationship to the risk of developing SSEH, however bleeding tendencies, such as haemophilia, which do construe a risk (8% of reported cases), are clearly more common in males [18]. One case was reported to be on anti-coagulation therapy and two have been reported to have an arterio-venous malformation.
