One hundred thirteen individuals who exhibited a DS phenotype and who had a positive SCN1A mutation were posted questionnaires, of whom 68 (60%) responded.21 The median age was seven years at baseline assessment (6 months to 42 years old, IQR = 4–15) and 17 (10 to 39 years old, IQR = 14–24) at follow-up. The gene discussed is SCN1A; the disease is Dravet syndrome.