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. 2017 Jul 3;9:48. doi: 10.1186/s13195-017-0271-9

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© The Author(s). 2017

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 — CSF Aβ₄₂ by age and gender and stratified by APOE genotype. Scatterplot of CSF Aβ₄₂ vs participant age and predicted means with 95% CIs predicted from linear regression on gender × age interaction adjusted for APOE-ε4 status (a), and stratified by APOE-ε4 negative (b) and positive (c) from linear regression on gender by age × APOE-ε4 interaction. Aβ₄₂ amyloid beta_1–42, APOE apolipoprotein E, CSF cerebrospinal fluid, yrs years