Fig. 6. Relationship between trabecular bone mineral densities (tBMDs) and chronological age among normal, PDH, and ADH patients at each vertebra. Predicted linear regression lines were developed and plotted along with scatter from actual data of tBMDs. The tBMDs-to age relationship was significant (R² = 0.02-0.3, p < 0.01-0.001). The statistically negative correlation between trabecular bone mineral density and age was confirmed. In addition, scatterplots showed that the tBMDs of HAC patients were lower than those of normal patients.