Table 1 summarizes the baseline characteristics of the patients who have or did not have acute pneumonia. Patients with pneumonia had a higher hs-C reactive protein level (p < 0.001) and a lower PaO2/FiO2 value (p < 0.048) than patients who did not have pneumonia. Pleural effusion was more common among patients with pneumonia (p < 0.0001). This evidence concerns the gene CRP and pneumonia.