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. 2019 Oct 15;9:14817. doi: 10.1038/s41598-019-51347-x

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Measurements of glucose, insulin, GLP-1, PYY, glucagon, and NEFA during an oral glucose tolerance test on the day before and six days after SG or RYGB surgery. Comparisons are made within groups for each type of surgery, and between groups for changes in concentrations from pre- to post surgery. Results are presented for N = 15 in the SG group and N = 16 in the RYGB group. Data are presented as median with 25–75 percentiles. *Within group comparisons at the same time point using Wilcoxon Signed Ranks Test ^#comparison of SG and RYGB values the day before surgery using Mann-Whitney test ^$comparison of SG and RYGB values six days after surgery using Mann-Whitney test ^†comparison of changes within group for SG and RYGB values using Mann-Whitney test P values < 0.05 were considered statistically significant.