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. 2023 Jun 8;46(12):2525–2533. doi: 10.1007/s40618-023-02107-2

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© The Author(s) 2023

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Fig. 2 — Line graph showing the relationship between vitamin D values (ng/mL) and the median PTH of individuals containing each possible analyte value for each age group. The fit line was created using the LOESS (LOcally Estimated Scatterplot Smoothing) technique. Dashed lines indicate the 25-OHD values of 20 and 30 ng/mL