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Distribution of serum osteocalcin levels in normal, osteopenia and osteoporosis groups. *, P=0.017 vs. the normal group; †, P=0.029 vs. the normal group; ‡, P=0.001 vs. the normal group and P=0.011 vs. the osteopenia group; §, P<0.001 vs. the normal group and P=0.004 vs. the osteopenia group; *†, P<0.001 vs. the normal group and P=0.029 vs. the osteopenia group.
