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. 2020 Jan 22;35(6):1069–1079. doi: 10.1007/s00467-020-04472-z

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© The Author(s) 2020

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Fig. 2 — Bland-Altman plots between measured and calculated free-25-hydroxyvitamin D (25(OH)D) by CKD stages. Horizontal dotted lines present mean percentage difference. CKD 2–3: n = 20 (unable to calculate free-25(OH)D concentration due to no VDBP data for one patient and no total-25(OH)D data for another); dialysis n = 18; transplant: n = 2.