The median CC-10 concentration of the VAP group was 3,019 ng/mL (range, 282-65,546 ng/mL) versus 2,054 ng/mL (range, 62-30,240 ng/mL) in the non-VAP group (P = 0.03; 95% confidence interval (95% CI), 0.025-0.380) (Figure 2), with an AUC of 0.586 (P = 0.06; 95% CI, 0.496-0.676) (Figure 3). This evidence concerns the gene CXCR1 and ventilator-associated pneumonia.