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. 2020 Jan 15;10:341. doi: 10.1038/s41598-019-56086-7

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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LOWESS curves showing association of birth weight, gestational age with lung function in original units by sex in Hong Kong’s “Children of 1997” Birth Cohort. Abbreviations: FEV₁, forced expiratory volume in 1 second; FVC, forced vital capacity; FEF_25–75%, forced expiratory flow at 25–75% of the pulmonary volume. Birth weight z-score refers to internal sex- and gestational age-specific z-scores.