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. 2017 Oct 10;10:497. doi: 10.1186/s13104-017-2825-0

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Differences in measurements between hot-wire, ultrasonic and wedge-bellows spirometers for FVC and FEV1. Bland–Altman plots with mean difference ± 1.96SD (95% limits of agreement) for hot-wire compared to ultrasonic spirometers (a), for wedge-bellows compared to ultrasonic spirometers (b), and for hot-wire compared to wedge-bellows spirometers (c). ***p < 0.001, n.s. not significant. p values are derived from linear mixed models analysis with the spirometer as fixed effect and a random intercept by subject, and are adjusted for multiple comparisons (Bonferroni correction). Significance level is set at 0.05