The Mayo Clinic website features a chart to help interpret bone density test results. Results of bone density tests are reported by T-scores and Z-scores, according to Mayo Clinic. The chart on the website assists in telling what the T-score means.
The T-score is the bone density of the individual being tested, compared to a healthy individual of that same sex, according to Mayo Clinic. The chart notes that T-scores of -1 and above are considered normal. T-scores between -1 and -2.5 indicate osteopenia. This is a condition characterized by low bone density and can lead to osteoporosis. Individuals with osteoporosis have T-scores that are -2.5 and below.