Relationship between the response to bronchodilator and the pre-bronchodilator FEV1 at visit 2. Relationship between the response to bronchodilator and.

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Presentation transcript:

Relationship between the response to bronchodilator and the pre-bronchodilator FEV1 at visit 2. Relationship between the response to bronchodilator and the pre-bronchodilator FEV1 at visit 2. (A) Absolute change in FEV1 is unrelated to initial FEV1. (B) Change as a percentage of baseline FEV1 is related to initial FEV1 in a curvilinear fashion which persisted even when the ATS absolute volume criteria were included (C). P M A Calverley et al. Thorax 2003;58:659-664 Copyright © BMJ Publishing Group Ltd & British Thoracic Society. All rights reserved.