ALB and Obesity: In subgroup analysis, no significant interactions were obtained between serum albumin and baseline characteristics, such as age, sex, obesity (BMI ≥25 kg/m2), reduced eGFR (<60 mL/min/1.73 m2), proteinuria (urinary protein excretion ≥2.0 g/24 h), the pathological parameters of the Oxford classification (M, E, S, T, and C scores).