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Correlation between the change in measured free and total 25(OH)D after cholecalciferol supplementation (left panel, 2000 IU/d; right panel, 4000 IU/d). Total 25(OH)D is expressed as ng/mL; free 25(OH)D is expressed as pg/mL. Blacks, n = 57; whites, n = 151. CaDDM, Calcium and Vitamin D for Diabetes Mellitus; DDM2, Vitamin D for Established Type 2 Diabetes; 25(OH)D, 25-hydroxyvitamin D.
