The formula to calculate the Bone Density Z-Score (Z) is:
\[ Z = \frac{D - \mu}{\sigma} \]
Where:
Let's say the measured bone density (D) is 1.2 g/cm², the population mean bone density (μ) is 1.0 g/cm², and the standard deviation (σ) is 0.1 g/cm². Using the formula:
\[ Z = \frac{1.2 - 1.0}{0.1} = 2 \]
So, the Z-Score is 2.
Definition: The Z-score in bone density measures how much your bone density deviates from the average bone density of people of the same age, sex, and body size.
Example: A Z-score of -1.5 means your bone density is 1.5 standard deviations below the average for your age, sex, and body size.
Definition: A chart that shows the interpretation of different Z-scores in bone density measurements.
Example:
Definition: The Z-score compares your bone density to the average bone density of people of the same age, sex, and body size.
Example: A Z-score of -2.0 indicates your bone density is 2 standard deviations below the average for your age, sex, and body size.
Definition: A chart that helps interpret Z-scores from bone density tests.
Example:
