On the T-score scale, 0 represents normal, healthy bone density of a 30-year-old person (the age of peak bone density). T-scores above 0 and slightly below 0 are within the normal range. Your score ...

Physicians typically measure two areas—the spine and hip—and then compare your actual bone density to the density your bones should be to resist breaking (which is the bone density of a 30-year-old).