CRP and susceptibility to pneumonia measurement: Median (1st quartile, 3rd quartile) CRP levels in younger and elderly groups were 9.66 (4.26, 16.99) mg/dL and 8.19 (3.84, 13.34) mg/dL (p = 0.26) for mild pneumonia, 9.88 (4.87, 17.42) mg/dL and 7.83 (3.15, 14.70) mg/dL (p = 0.08) for moderate pneumonia, and 21.71 (9.05, 32.51) mg/dL and 8.81 (4.37, 17.05) mg/dL (p = 0.02) for severe pneumonia, respectively (Fig. 3, right upper).