CCL2 and delirium: Patients aged 65 and more who developed delirium after surgery had significantly higher baseline MCP-1 concentrations compared to younger, non-delirious subjects (466.66 ng/mL; IQR: 371.81–554.67 vs. 326.96 ng/mL; IQR: 263.01–408.31, p = 0.008).