From: Comparison of the variability of the annual rates of change in FEV1 determined from serial measurements of the pre- versus post-bronchodilator FEV1 over 5 years in mild to moderate COPD: Results of the lung health study
Intervention Group
Proportion with significant change in FEV1(95% CI)
Pre-bronchodilator FEV 1
Post-bronchodilator FEV1
UC
40.1 (37.6-42.6)
38.7 (36.2-41.2)
SIP
27.8 (25.6-30.1)
30.5 (28.1-32.8)
SIA
27.0 (24.7-29.2)
25.4 (23.3-27.6)