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Bone mineral density (BMD) in grams per square cm is the typical measure.
T-score is the number of standard deviations from the mean (average) value for a 20-30 yr. old caucasian female.
* Normal bone: T-score better than -1. * Osteopenia: T-score between -1 and -2.5 * Osteoporosis: T-score less than -2.5 See: Bone Density at washington.eduBMD for men is 13% higher at age 55, 25% higher at age 75. not all studies show that the fracture risk is the same for men and women with identical bone density values (in g/cm2).
See "The Relationship between Bone Density and Incident Vertebral Fracture in Men and Women" at http://www.srl.cam.ac.uk/epos/
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