CRP and susceptibility to pneumonia measurement: Significantly, there were close linear correlations between MEG3 and neutrophils (R = 0.772, P < 0.001, Table 2), CRP (R = 0.634, P < 0.001, Table 2), and PCT (R = 0.727, P < 0.001, Table 2), highlighting that MEG3 had a high possibility as a promising biomarker in severe pneumonia.