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. 2014 May 20;24:14002. doi: 10.1038/npjpcrm.2014.2

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Copyright © 2014 Primary Care Respiratory Society UK/Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/4.0/

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Bland–Altman plot comparing: (a) the FEV₁/FEV₆ (%) obtained from Vitalograph COPD-6 6-SS with that obtained from pre-bronchodilator spirometry, (b) FEV₁/FEV₆ (%) from COPD-6 with that obtained in the laboratory from the flow-volume calibration syringe. Horizontal dotted lines at about 10 and 20 indicate the limits of agreement of the % FEV₁/FEV₆ difference (within 2 standard deviations of the mean difference). The line over the points corresponds to the median band of the % FEV₁/FEV₆ difference.