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. 2024 Oct 21;14:24664. doi: 10.1038/s41598-024-75684-8

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, 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 you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. 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-nc-nd/4.0/.

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Fig. 2 — Shapley additive explanation (SHAP) dependence plots for PTB and SPTB. (a) MGI vs SHAP values for PTB show positive correlation. (b) DMFT vs SHAP values for SPTB show U-shaped relationship. The secondary y-axis on the right represents the index values of pre-pregnancy BMI. Blue (red) dots denote low (high) pre-pregnancy BMI. PTB, preterm birth; SPTB, spontaneous preterm birth; MGI, modified gingival index; DMFT, decayed, missing, filled teeth; BMI, body mass index.