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. 2019 Dec 4;13:62. doi: 10.1186/s40246-019-0244-0

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Effects of BMI on the percentage of fetal fraction. a Distribution of BMI across all 13,661 subjects in the six groups. b Distribution of BMI across all 13,661 subjects in the four groups. c Effects of BMI on the percentage of fetal fraction between the six groups. d Effects of BMI on the percentage of fetal fraction between the four groups. One asterisk represents the significant difference at P < 0.05 level. Two asterisks represent the significant difference at P < 0.01 level