The Z-score compares you against an average person of your age and sex. So, an elderly woman might have a low T-score of -2.6 and a Z-score of 0, meaning that she has the expected bone loss of a ...

A diagnosis of osteoporosis is made if a person’s T-score is -2.5 or lower. Takeaway. The lower a person’s T-score, the more severe their bone loss is, and the more at risk for fractures they are.