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What are the DEXA t-scores and z-scores?

2 doctors weighed in
Dr. Allen Lu
Orthopedic Surgery
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In brief: Statistic measures

The t-score is a "statistic" measure of how dense your bone is compared to a "standard young adult".
A -1.0 t-score means that you measured 1 standard deviation lower than the standard young adult. A z-score compares your bone density with a group in your own age group. A -1.0 z-score means that you measured 1 standard deviation lower than someone your age. It is the better predictor.

In brief: Statistic measures

The t-score is a "statistic" measure of how dense your bone is compared to a "standard young adult".
A -1.0 t-score means that you measured 1 standard deviation lower than the standard young adult. A z-score compares your bone density with a group in your own age group. A -1.0 z-score means that you measured 1 standard deviation lower than someone your age. It is the better predictor.
Dr. Allen Lu
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