Figure 2From: 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 Mean values of pre- and post-bronchodilator FEV 1 at screening visit 2 and annual visits 1 through 5 in A) UC group, B) SIP group and C) SIA group. Back to article page