AUCROC analysis showed that PTX3 levels in BAL fluid predicted pneumonia (AUCROC =0.815, 95% CI =0.710 to 0.921, P <0.0001), whereas BAL fluid levels of sTREM-1, plasma PTX3, sTREM-1, CRP and PCT did not (Figure 2). This evidence concerns the gene PTX3 and pneumonia.