From: The value of bronchodilator response in FEV1 and FeNO for differentiating between chronic respiratory diseases: an observational study
ΔFEV1 (mL)
Sensibility (%)
Specificity (%)
PPV (%)
NPV (%)
Youden index
345
72.9
91.1
81.0
86.6
0.640
355
70.0
91.9
81.7
85.5
0.619
365
68.6
94.1
85.7
85.2
0.627
375
67.1
94.8
87.0
84.8
385
65.7
95.6
88.5
84.3
0.613