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. 2022 Oct 6;9(1):e001385. doi: 10.1136/bmjresp-2022-001385

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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FEV₃/FVC plotted against FEF_25-75 z-score. A scatter plot showing the relationship between FEF_25-75 z-score and FEV₃/FVC. The coefficient of determination (r²) for the WLS regression is shown in the figure along with its p value. FEF_25-75, forced expiratory flow between 25% and 75% of vital capacity; FEV₁, forced expired volume in 1 s; FVC, forced vital capacity; WLS, weight-least square.