Table 2 Measurement of bone mineral density of lumbar spine and femoral neck
Variable | On presentation | After 1 year | After 2.5 years |
|---|---|---|---|
T-score | |||
 Lumbar vertebra | − 1.2 | − 1.1 | − 1.0 |
 Femoral neck |  | − 2.5 | − 2.5 |
 Total hip |  | − 1.9 | − 2.1 |
Z-score | |||
 Lumbar vertebra | − 1.3 | − 1.1 | − 0.9 |
 Femoral neck |  | − 2.2 | − 2.2 |
 Total hip |  | − 1.8 | − 1.8 |
Young adult mean (age-matched) (%) | |||
 Lumbar vertebra | 86 | 87 | 89 |
 Femoral neck |  | 68 | 68 |
 Total hip |  | 76 | 75 |