| 1. | Normal | BMD not more than-1 standard deviations (SD) below the mean value of peak bone mass in young normal women. |
| 2. | Low bone mass (Osteopenia) | BMD within-1 standard deviations (SD) and - 2.5 standard deviations (s.d.) of the mean value of peak bone mass in young normal women. |
| 3. | Osteoporosis | BMD less than - 2.5 standard deviations (SD) below the mean value of peak bone mass in young normal women. |
| 4. | Established Osteoporosis | BMD less than-2.5 standard deviations (SD) below the mean value of peak bone mass in young normal women and the presence of fractures. |
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