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Figure 1 | Respiratory Research

Figure 1

From: Acute bronchodilator responses decline progressively over 4 years in patients with moderate to very severe COPD

Figure 1

Mean absolute bronchodilator responses (±SD) (Δ = post- minus pre-bronchodilator FEV1 and FVC, ml) over 4 years by treatment group separately (placebo and tiotropium). Mean absolute FEV1 responses are shown for the placebo group (A) and the tiotropium group (B) separately. Mean absolute FVC responses are shown for the placebo group (C) and the tiotropium group (D) separately.

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