Fig. 1. Comparison of pulmonary function in patients with no or mild pneumonia and patients with severe pneumonia. (A) FVC. (B) FEV₁. (C) DLCO. P values were adjusted for age, sex, underlying lung disease, and smoking. Whiskers indicate minimum and maximum values.

FVC = forced volume vital capacity, FEV₁ = forced expiratory volume in 1 second, DLCO = diffusing capacity, MERS = Middle East respiratory syndrome.