ALB and brain disorder: The number of cases for each parameter was as follows: age ≥ 80 years, 70 cases (4.2 %); BMI ≥ 30 kg/m2, 93 cases (5.6 %); previous antibiotic use, 337 cases (20.4 %); corticosteroid use, 36 cases (2.2 %); serum albumin < 3.5 g/dL, 18 cases (1.1 %); GFR < 50 mL/min, 108 cases (6.5 %); brain disease, 54 cases (3.3 %); thyroid disease, 29 cases (1.8 %); cardiac disease, 21 cases (1.3 %); pulmonary disease, 20 cases (1.2 %); diabetes, 109 cases (6.6 %); asthma, 55 cases (3.3 %); smoking habit, 76 cases (4.6 %); and revision surgery, 155 cases (9.4 %).