Pre-bronchodilator Forced Expiratory Volume in One Second (FEV1) Rate of Decline From Day 30 to 4 Years From day 30 to 4 years [clinicaltrials_resource:0ff78ae027595754ccb4b617c34a07a6]

Rate of decline of forced expiratory volume in one second (FEV1) measured before the use of bronchodilators. A negative rate of decline indicates decreasing FEV1 over time, while a positive value indicates increasing FEV1.

Pre-bronchodilator Forced Expiratory Volume in One Second (FEV1) Rate of Decline From Day 30 to 4 Years From day 30 to 4 years [clinicaltrials_resource:0ff78ae027595754ccb4b617c34a07a6]

Rate of decline of forced expiratory volume in one second (FEV1) measured before the use of bronchodilators. A negative rate of decline indicates decreasing FEV1 over time, while a positive value indicates increasing FEV1.