IL1B and familial Mediterranean fever: A nationwide report on IL-1 treatment of patients with FMF revealed that 172 FMF patients (83 [48%] female; mean age, 36.2 years [range, 18–68]) were included; the mean age at onset was 12.6 years (range, 1–48), and the mean colchicine dose was 1.7 mg/day (range, 0.5–4.0).