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. 2016 Oct 18;15:98. doi: 10.1186/s12940-016-0179-z

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© The Author(s). 2016

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. 1 — Restricted Cubic Spline for Temperature. Notes: Reference exposure value set at 70 °F, including 5 knots. This figure displays a restricted cubic spline from conditional logistic regression with temperature as the predictor and COPD exacerbation as the outcome