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. 2018 May 16;8:7722. doi: 10.1038/s41598-018-26077-1

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© The Author(s) 2018

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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The radar charts of each sagittal plane for all age groups and the line charts of differential value of different age groups in each sagittal group. In the radar charts, Young: young group; Middle-aged: middle age group; Old: old age group. A1, B1, C1, D1, E1 and F1: The radar charts of each sagittal plane for all age groups. A2, B2, C2, D2, E2 and F2: The line charts of differential value of different age groups in each sagittal group. Right Inside Slice: the right inside sagittal slice of the L4/5 segment. Right Middle Slice: the right middle sagittal slice of the L4/5 segment. Right Outside Slice: the right outside sagittal slice of the L4/5 segment. Left Inside Slice: the left inside sagittal slice of the L4/5 segment. Left Middle Slice: the left middle sagittal slice of the L4/5 segment. Left Outside Slice: the left outside sagittal slice of the L4/5 segment. In the line charts, Young: the differential value between the young and middle age groups. Middle-aged: the differential value between the middle age and old age groups. Old: the differential value between the young and old age groups.