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. 2023 Jul 14;13:11386. doi: 10.1038/s41598-023-38294-4

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© The Author(s) 2023

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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Trend of ASR of syphilis from 1990 to 2019. (A) ASR of prevalence grouped by sex; (B) ASR of DALYs grouped by sex; (C) ASR of prevalence grouped by age, age 15–49 and 50–69 groups are depicted on the left axis, while other age groups are depicted on the right Y-axis; (D) ASR of DALYs grouped by age, age 15–49, 50–69, and ≥ 70 groups are depicted on the left axis, while age group < 14 years is depicted on the right Y-axis; (E) ASR of prevalence grouped by SDI levels, and low and low middle SDI groups are depicted on the left axis, while other SDI groups are depicted on the right Y-axis. (F) ASR of DALYs grouped by SDI levels, and low and low middle SDI groups are depicted on the left axis, while other SDI groups are depicted on the right Y-axis. DALYs disability-adjusted life years, ASR age-standardized rate, SDI sociodemographic index.