CRP and ventilator-associated pneumonia: In serum, the median levels of PTX-3, SP-D and CRP levels at the four timepoints in the high VAP group were 6–10 ng/mL, 6–39 ng/mL and 2–30 mg/L compared to 7–8 ng/mL, 8.3–58 ng/mL and 15–43 mg/L in the low VAP group, respectively (Figure 1, panels A–C).