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. 2020 Sep 3;10(9):e037720. doi: 10.1136/bmjopen-2020-037720

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Mean age (95% CIs) by eGFR values for participants aged 18 years and over of ENS 2009–2010 and ENS 2016–2017. eGFR (measured in mL/min/1.73 m²) determined by CKD-EPI equation. Presence of reduced kidney function (CKD stages G3a–G5) considered as eGFR <60 mL/min/1.73 m². Categories based on definition by KDIGO.⁵ CKD-EPI, Chronic Kidney Disease Epidemiology Collaboration; eGFR, estimated glomerular filtration rate; ENS, Encuesta Nacional de Salud; KDIGO, Kidney Disease Improving Global Outcomes.