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. 2015 Jun 25;10:1213–1218. doi: 10.2147/COPD.S85166

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© 2015 Pothirat et al. This work is published by Dove Medical Press Limited, and licensed under Creative Commons Attribution – Non Commercial (unported, v3.0) License

The full terms of the License are available at http://creativecommons.org/licenses/by-nc/3.0/. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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Correlation between FEV₁ and PEFR in patients with COPD.

Notes: (A) Correlation between % predicted FEV₁ and % predicted PEFR (r=0.76, P<0.001); (B) correlation between absolute value of FEV₁ and PEFR (r=0.87, P<0.001).

Abbreviations: FEV₁, forced expiratory volume in 1 second; PEFR, peak expiratory flow rate.