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. 2021 Sep 30;15:17534666211037454. doi: 10.1177/17534666211037454

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© The Author(s), 2021

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 2. — Correlation plots (a and b) and Bland–Altman graphs (c and d) of predicted W_MAX versus measured W_MAX: predicted value from the new prediction algorithm was used in the pooled dataset (in a and c) and in study C (b and d). (a and b) Dotted line is line of identity. (c and d) Solid line shows the mean difference. Dotted lines show the limits of agreement, defined as the mean difference ± 1.96 SD of differences.

DLCO, diffusing capacity for carbon monoxide; FEV₁, forced expiratory volume in 1 s; SD, standard deviation.

^aIncluded variables: DLCO, FEV₁, sex, age and height.