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UD radius aBMD reference curves for non-African American males, non-African American females, African American males, and African American females. Within each figure, the 2 (solid line), 1 (dashed line), 0 (solid line), -1 (dashed line), and -2 (solid line) SD curves are displayed. aBMD, areal bone mineral density; UD, ultradistal.
