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. 2021 Jan 14;11:1345. doi: 10.1038/s41598-020-79750-9

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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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Summary of heart rate variability (HRV) measurements between patients with ovarian endometriomas (OE) and healthy women (Controls). Total RMSSD (A), pNN50 (%) (B) and HF (C) are reduced significantly in patients with endometriosis as compared with controls. (D) The difference in LF did not reach statistical significance. (E) The mean LF/HF ratio is significantly higher in patients with endometriosis patient as compared with controls. (F) Scatter plot showing the relationship between HF and RMSSD, both log-transformed. Each red and blue dot represents one data point from patient with endometriosis and controls, respectively. The dashed line represents the regression line. The Pearson’s correlation coefficient is shown, along with its statistical significance level. Symbols for statistical significance levels: NS: p > 0.05; *p < 0.05; **p < 0.01; ***p < 0.001.