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. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: Respir Med. 2015 Jun 24;109(8):1058–1062. doi: 10.1016/j.rmed.2015.06.012

Figure 1.

Figure 1

Figure 1

Distribution of change in FEV1 and FVC with bronchodilator use

N = 967 unique spirometry tests with pre and post-bronchodilator measurements of FEV1 (a) and FVC (b). The dashed vertical line represents a 12% improvement in FEV1 or FVC following bronchodilator, corresponding to physiologic airflow limitation.