Relationship between muscle strength and serum advanced oxidation protein products (AOPPs) levels in patients undergoing haemodialysis. (A, B) Relationship between serum AOPPs levels and grip strength in dialysis patients with sarcopenia (closed circle), pre‐sarcopenia (open circle), and without sarcopenia (closed triangle) (A: male, B: female). (C, D) Relationship between serum AOPPs levels and skeletal mass index (SMI) in dialysis patients with sarcopenia (closed circle), pre‐sarcopenia (open circle), and without sarcopenia (closed triangle) (C: male, D: female). (E, F) Relationship between oxidized albumin (Cys‐albumin) and grip strength in dialysis patients with sarcopenia (closed circle), pre‐sarcopenia (open circle), and without sarcopenia (closed triangle) (E: male, F: female). (G, H) Relationship between oxidized albumin (Cys‐albumin) and SMI in dialysis patients with sarcopenia (closed circle), pre‐sarcopenia (open circle), and without sarcopenia (closed triangle) (G: male, H: female). (I) Relationship between serum AOPPs levels and oxidized albumin (Cys‐albumin) in dialysis patients with sarcopenia (closed circle), pre‐sarcopenia (open circle), and without sarcopenia (closed triangle).