ALB and anti-neutrophil cytoplasmic antibody-associated vasculitis: The levels of hemoglobin, ALB, and eGFR in AAV patients with thyroid dysfunction were lower than those of patients with normal thyroid function (85.92 ± 20.8 g/L vs. 104.00 ± 24.93 g/L, p < 0.001; 33.05 ± 6.28 g/L vs. 38.86 ± 4.68 g/L, p = 0.003; 11.00 (6.62, 23.44) mL/min/1.73 m2 vs. 44.32 (13.89, 68.75) mL/min/1.73 m2, p < 0.001; respectively).