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. 2022 Mar 19;23:62. doi: 10.1186/s12931-022-01976-0

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© The Author(s) 2022

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. 8 — Kaplan–Meier analysis. a Non-elective hospitalization, b IPF-related hospitalization, c LTOT initiation, d composite endpoint. Number of events are in brackets. Non-elective hospitalizations were identified based on records for “emergency admission”, with the following admission codes being excluded: “delivery of birth”, “organ removal”, “pre-hospital treatment”, “inpatient stay with prior pre-hospital treatment”. The composite endpoint consists of non-elective hospitalization, IPF-related hospitalization and LTOT initiation. CI confidence interval, IPF idiopathic pulmonary fibrosis, LTOT long-term oxygen therapy