CCL2 and anxiety disorder: Preoperative MCP-1 level was also increased in individuals with a diagnosis of anxiety disorders who developed postoperative delirium compared to patients without anxiety disorders and without postoperative delirium (546.65 ng/mL; IQR: 450.45–598.58 vs. 352.44 ng/mL; IQR: 288.13–448.81, p = 0.05).