CCL2 and ventilator-associated pneumonia: When MCP-1 level was categorized in a unit of 500 ng/mL and VAP patients were divided in three categories with MCP-1 levels <500 ng/mL, 500–1000 ng/mL, and >1000ng/mL, MCP-1 tertiles at study enrollment differed significantly in survival (log-rank test, 58.1479; p < 0.0001; Figure 7).