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. 2021 Nov 23;21:382. doi: 10.1186/s12890-021-01684-3

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Longitudinal levels of type VI collagen biomarkers in nintedanib, pirfenidone and untreated IPF patients. Serum levels of PRO-C6 (A) and C6M (B) are shown at baseline, six months and 12 months for pirfenidone (dark turquoise), nintedanib (turquoise) and non-treatment (grey) patients with IPF. Data are presented as geometric mean with 95% CI (error bars) adjusted for age and sex. The number of evaluable samples available for analysis at each time point is provided below the graphs. The interaction between timepoint and treatment was not significant forPRO-C6 (P = 0.87) and for C6M (P = 0.70). A significant average contrast across all timepoints between pirfenidone and non-treatment for C6M is shown as * (P < 0.05)