Fig. 1

Receiver operating characteristic curves for bacterial pneumonia in 126 patients with community-acquired pneumonia. A Sputum volume, IL-10, and AAT. B Sputum-volume score. C α1-antitrypsin/IL-10 ratio. The values in Figures (B) and (C) are cutoff values (sensitivity and specificity). AUC: the area under the curve; CI: confidence interval