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. 2020 Jan 8;21:11. doi: 10.1186/s12931-019-1271-z

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© The Author(s). 2020

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 — Smooth cubic spline curve of the adjusted hazard ratio (solid line) and 95% CIs (dotted lines) of death, estimated by Cox proportional hazards model, as a function of: a) age at IPF diagnosis; b) % predicted FVC; and c) % predicted TL_CO