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. 2021 Jan 14;11:1451. doi: 10.1038/s41598-021-80989-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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Twelve-year trend of incidence of retinopathy of prematurity (ROP) among premature infants according to gestational age (GA) groups. The stacked bar graph above the horizontal axis indicates the annual number of premature infants of 28 weeks ≤ GA < 37 weeks, with and without ROP, and incidence of ROP (%). The stacked bar graph below the horizontal axis indicates the annual number of premature infants of GA < 28 weeks, with and without ROP, and incidence of ROP (%). The line graph indicates the annual incidence of ROP among premature infants with a GA < 37 weeks. GA gestational age, ROP retinopathy of prematurity.