AUC: area under the curve; ROC: receiver operating characteristic; FENO:
fractional exhaled nitric oxide; FEV1: forced expiratory
volume in 1 second; FVC: forced vital capacity; FEF: forced expiratory
flow; FEF50%: FEF at 50% of FVC;
FEF70%: FEF at 70% of FVC;
FEF25%-75%: FEF at 25% to 75% of
FVC.