CRP and systemic lupus erythematosus: Concerning the levels of free thiols, SLE patients with eGFR < 60 ml/min, sCr ≥ 90 μmol/L, CRP ≥ 5 mg/L, body mass index (BMI) ≥ 30 kg/m2 had lower median levels of free thiols, reflecting more OS (p < 0.001, < 0.001, 0.003, 0.006, respectively).