I have osteoporosis and a copy of the X-ray and report. What's a z-score?

Your age group. The z score compares you to someone your age. T score compares you to a 25yo. If your z score is lower than a -1.5, you are at risk for secondary caues of bone loss such as thyroid dis.
Not as useful. As a t score. The z score is the how your bone density compares to someone else your age. It is given in a percent. The more important number is the t score which is a patient's bone density compared to a normal female bone density. This means more as we can see how much bone loss has occurred and make a decision if osteoporosis is present. The t score is also given as percent.