Δ Spirometric parameters (ΔFEV1, ΔFVC, ΔFEV1/FVC, ΔMMEF, ΔMEF25, ΔMEF50) denoted the difference before and at 60 min after salbutamol inhalation.
ΔAi/BSA denoted the difference of Ai/BSA before and at 15 min after inhaling salbutamol.
Data in bold indicated the correlation coefficient with statistical significance.
Abbreviation: FEV1: forced expiratory volume in one second; FVC: forced vital capacity; MMEF: maximum midexpiratory flow; MEF25: Maximal expiratory volume when 25% of the lung volume has been expired; MEF50: Maximal expiratory volume when 50% of the lung volume has been expired.