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. 2021 Apr 7;11:7669. doi: 10.1038/s41598-021-87452-z

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© The Author(s) 2021

Open Access This 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/.

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Associations of vertical lung lengths (VLLs) with the extent of lung abnormalities on chest CT images. The association of reticular pattern, honeycombing, and ground-glass opacity with upper VLL (uVLL) (A–C), lower VLL (lVLL) (D–F), total VLL (tVLL) (G–I), and l/uVLL ratio (J–L) are shown. The extents of the lung abnormalities were semi-quantitatively evaluated as follows: grade 0 (0%), grade 1 (< 25%), grade 2 (25–50%), grade 3 (50–75%), and grade 4 (> 75%). The white, grey, and black boxes in the images represent grade 1, 2, and ≥ 3 for reticular pattern, respectively, or grade 0, 1, and ≥ 2 for honeycombing and ground-glass opacity, respectively.