ALB and rheumatoid arthritis: In the univariate analysis of the training set, the transfusion group and non-transfusion group differed in BMI, ASA Physical Status > 2, anemia, femoral head necrosis, developmental dysplasia of the hip, osteoarthritis, rheumatoid arthritis, hemophilic arthritis, ankylosing spondylitis, osteoporosis, hip stiffness, total hip arthroplasty, artificial femoral head replacement, revision surgery, debridement, autotransfusion, operation time, hemoglobin, PT, APTT, D-dimer, fibrinogen, ALT, total bilirubin, albumin and creatinine (Table 2).