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. 2019 May 24;20:102. doi: 10.1186/s12931-019-1075-1

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© The Author(s). 2019

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. 2 — Graphical summery of airflow, ventilation inhomogeneity and gas diffusion. The boxplots show the median values and IQR for (a): FEV₁; (b): FEV_1,/FVC ratio, (c): D_Lco and (d): LCI .*: p ≤ 0.05; **: p ≤ 0.01; ***: p ≤ 0.001 Abbreviations: BPD: bronchopulmonary dysplasia; IQR: inter quartile range; FEV₁: forced expiratory volume in 1 s; FVC: forced vital capacity; D_{Lco adj}: diffusing capacity of the lung for carbon monoxide, adjusted for haemoglobin; LCI: lung clearance index