Absolute change in percent predicted forced expiratory volume in 1 second (ppFEV1)|Absolute change in sweat chloride (SwCl)|Absolute change in forced vital capacity (FVC)|Absolute change in forced expiratory flow at mid-lung capacity (FEF25-75)|Relative change in percent predicted forced expiratory volume in 1 second (ppFEV1)|Relative change in forced expiratory flow at mid-lung capacity (FEF25-75)|Relative change in forced vital capacity (FVC)