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. 2023 Mar 10;13(3):e068148. doi: 10.1136/bmjopen-2022-068148

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© Author(s) (or their employer(s)) 2023. 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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Restricted cubic spline plot of the association between RDW and CVD (A), CHF (B), CHD (C), angina (D), heart attack (E), stroke (F). RDW was log2-transformed. Adjustments were made according to gender, age, race, education, smoking status, body mass index, diabetes, hypertension, chronic kidney disease, history of anaemia treatment, haemoglobin, mean blood cell volume, iron, triglyceride, high-density lipoprotein and total cholesterol. The results are weighted based on the survey. P indicates the results of a test for non-linearity. CHD, coronary heart disease; CHF, congestive heart failure; CVD, cardiovascular disease; RDW, red cell distribution width.