Fig. 2

Receiver operating characteristic (ROC) curve analysis for the diagnosis of IPF. a The ROC curve of the TSLP protein concentration in the patients with IPF and the controls (Area under the curve [AUC] = 0.655, cut-off = 3.52 pg/μg; 99.2% accuracy, 96.7% specificity, 100% sensitivity) and b IL-33 protein concentration in patients with IPF and the controls (AUC = 0.706, cut-off = 3.77 pg/μg; 94.3% accuracy, 80% specificity, 100% sensitivity). c ROC curve of the TSLP protein concentrations among patients with IPF and those with other interstitial lung diseases (ILD) (AUC = 0.786, cut-off = 4.66 pg/μg; 99.4% accuracy, 98.4% specificity, 100% sensitivity) and d IL-33 protein concentration in patients with IPF and the other ILD groups (AUC = 0.781, cut-off = 2.52 pg/μg; 93.2% accuracy, 90.2% specificity, 95% sensitivity)