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Relationship between calcium absorption and vitamin D metabolites. A, Calcium absorption was not associated with serum 25OHD after adjustment for age, body weight, calcium intake, serum 1,25(OH)2D, and serum creatinine (r = 0.05, P = 0.247). B, Calcium absorption was significantly correlated positively with serum 1,25(OH)2D after adjustment for age, body weight, calcium intake, serum 25OHD, and serum creatinine (r = 0.224, P < 0.0005).
