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. 2018 Nov 29;16:219. doi: 10.1186/s12916-018-1198-0

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© The Author(s). 2018

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. 3 — Restricted cubic spline model of the hazard ratios of cardiovascular mortality with the frequency of sauna bathing. Restricted cubic spline functions were analyzed with knots located at 5th, 35th, 65th, and 95th percentiles of sauna bathing frequency distribution, with the reference category set at one session/week; adjusted for age, gender, body mass index, smoking, systolic blood pressure, serum low-density lipoprotein cholesterol, alcohol consumption, previous myocardial infarction, and type 2 diabetes. The dashed lines represent the 95% confidence intervals