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Statistical analysis results. (A) Alkaline phosphatase and bone mineral density (BMD); (B) type I collagen amino-terminal extension peptide and BMD; (C) type I collagen degradation products and BMD; (D) osteocalcin N-terminal molecular fragments and BMD; (E) 25-hydroxyvitamin D and BMD; (F) history of taking steroid drugs and BMD.
