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. 2020 May 19;11:2042018820920551. doi: 10.1177/2042018820920551

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© The Author(s), 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — (a) Percentage of all patients receiving existing LT4 prescriptions fit to a model with a knot at year 2012 using spline regression analysis (95% confidence limits are displayed). (b) Percentage of patients receiving existing LT4 prescriptions for a diagnosis of hypothyroidism fit to a model with a knot at year 2012 using spline regression analysis (95% confidence limits are displayed). (c) Percentage of patients receiving existing LT4 prescriptions without a diagnosis of hypothyroidism fit to a linear model (95% confidence limits are displayed).

Existing, patients receiving existing LT4 prescriptions; Existing-w, patients with a diagnosis of hypothyroidism receiving existing LT4 prescriptions; Existing-wo, patients without a diagnosis of hypothyroidism receiving existing LT4 prescriptions; LT4, levothyroxine.