ALB and chronic obstructive pulmonary disease: Besides, delirious patients showed significantly larger incidence of dementia (27.19% vs. 5.83%, p = 0.000), coronary heart disease (41.23% vs. 24.17%, p = 0.005), renal insufficiency (30.70% vs. 16.67%, p = 0.011), COPD (37.72% vs. 19.17%, p = 0.002), longer operation duration (81.32 ± 21.11 min vs. 74.45 ± 19.33 min, p = 0.010), lower postoperative hemoglobin level (91.11 ± 15.89 g/L vs. 95.85 ± 17.04 g/L, p = 0.029) and albumin level (29.90 ± 2.51 g/L vs. 31.02 ± 2.85 g/L, p = 0.002).