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Table 2 Diagnostic validity of the studied parameters for exacerbation of CEP

From: Significance of fractional exhaled nitric oxide in chronic eosinophilic pneumonia: a retrospective cohort study

Variable AUC Cutoff value Sensitivity Specificity
FeNO level 0.835 66.0 ppb 0.80 0.84
   50.0 ppb* 0.80 0.77
ΔFeNO 0.918 8.4 ppb 0.83 0.84
   10.0 ppb** 0.67 0.86
Peripheral eosinophil percentage 0.906 8.4% 0.89 0.79
Peripheral eosinophil count 0.923 451 cells/μL 0.89 0.83
  1. *FeNO level > 50 ppb is indicative of eosinophilic inflammation and corticosteroid responsiveness in symptomatic patients [20].
  2. **ΔFeNO > 10 ppb indicates significant increase in FeNO level [20].