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Relation between total body BMC or BMD and urinary calcium:creatinine ratios in females (n=50) with Rett syndrome: (A) total body BMC(g) = 342 − 0.73 urinary calcium:creatinine(mg/g) + 40 age (y), p<0.01, r = -0.85; (B) total body BMD(g/cm2) = 0.65 − 0.0003 urinary calcium:creatinine(mg/g) + 0.01 age (y), p<0.01, r = -0.84.
