Wikipedia: Postmenopausal osteoporosis

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that is characterized by the following features :

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of patient's BMD expressed as number of standard deviations below or above
mean BMD of the young adult.

Postmenopausal Osteoporosis is a pathological condition of human skeleton that is characterized by the following features :

low bone mass
bone fragility caused by worsening of microarchiectural properties of the bone
consequent suseptibility to fractures

Osteoporosis is assesed, according to WHO criteria, as BMD (bone mineral density). So called T-score is a representation of patient's BMD expressed as number of standard deviations below or above mean BMD of the young adult.

T-score values below 2.5 SD are defined as characteristic of osteoporosis. Values between -1 SD and -2.5 SD are defined as osteopenia?.