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. 2017 Jun 30;17:97. doi: 10.1186/s12890-017-0441-3

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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. 2 — Z-scores presented as median (25th and 75th centiles) for FVC, FEV₁ and FEV₁/FVC at 7 and 14 years of age in children with no, mild, moderate, severe and all BPD. P-values for comparison of the change from 7 to 14 years in mild, moderate and severe BPD groups compared to the non-BPD group. Nonparametric test for trend across ordered groups comparing mild, moderate and severe BPD to the non-BPD group. P * ≤0.05, ** ≤ 0.01, *** ≤0.001