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. 2021 Sep 8;11:17830. doi: 10.1038/s41598-021-97205-7

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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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Plasma vitamin B6 levels in patients after different bariatric surgery procedures. Data are presented as median plasma vitamin B6 levels and interquartile range (IQR) for each bariatric surgery procedure. Mean values were 176 nmol/l (IQR 104–205), 161 nmol/l (IQR 87–186), 110 nmol/l (IQR 88–132), and 347 nmol/l (IQR 102–577) in patients with Roux-en-Y gastric bypass (RYGB), laparoscopic sleeve gastrectomy (LSG), gastric banding (GB), and biliopancreatic diversion (BPD). Kruskal–Wallis-Test for intergroup comparison was significant (p-value 0.033). Level of significance between RYGB and LSG was calculated with Mann–Whitney U-test and is indicated in the graph with horizontal bar. Level of significance was not calculated for differences between gastric bypass (GB) or biliopancreatic diversion (BPD) due to low sample size. n number of plasma vitamin B6 measurements in 205 patients in 2017.