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. 2009 Dec 29;4:443–452. doi: 10.2147/copd.s8577

Figure 2.

Figure 2

ΔFEV1 (mL/year) in augmented and non-augmented patients by initial FEV1 % of predicted (>65%, 30% to 65% and <30%). *P = 0.0006, **P = 0.07.