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. 2021 Apr 27;11(5):785. doi: 10.3390/diagnostics11050785

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Scatter plots of post-bronchodilator (post-BD) forced expiratory volume in 1 s (FEV₁)/forced vital capacity (FVC) ratios that were determined using the diagnostic spirometer against pre-BD FEV₁/FVC ratios that were determined using Spirobank Smart for eligible participants. The quadrants are defined by the GOLD spirometer criteria for obstruction (post-BD FEV₁/FVC < 70%) and the Spirobank-Smart-measured FEV₁/FVC ratios that yielded optimal performance characteristics (FEV₁//FVC < 74%).