See below: According to the world health organization. Normal bone is based on standard deviations of bone loss as compared to normal bone. The more negative the number the more bone loss. Normal 0 to -1 standard deviations, osteopenia is -1 to -2.5 standard deviations, and anything more negative then -2.5 standard deviations is osteoporosis.
Answered 4/11/2014
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