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. 2021 Jan 19;11:1808. doi: 10.1038/s41598-021-81379-1

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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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Comparisons of parameters of betatrophin (a), AHI (b), mean SaO₂ (c), minimum SaO₂ (d), CT90% (e), VFA (f), SFA (g) and TFA (h) between baseline and one year after RYGB. **p < 0.001. Data were shown as mean (95% confidence interval). RYGB Roux-en-Y gastric bypass, AHI apnea hypopnea index, SaO₂ oxygen saturation, CT90% percentage of time spent at SaO₂ < 90%, VFA visceral fat area, SFA subcutaneous fat area, TFA total fat area.