MEFV and juvenile idiopathic arthritis: Serum sTNFR-I levels were significantly elevated in the active phase in patients with s-JIA compared with FMF (median, 1,260 pg/mL; IQR 1,113–1,635) (p < 0.01) and TRAPS (median, 920 pg/mL; IQR 890–1,000) (p < 0.01).