A T-score of -1.0 or above is normal bone density, for example 0.9, 0 and -0.9. A T-score between -1.0 and -2.5 means you have low bone density or osteopenia, eg. T-scores of -1.1, -1.6 and -2.4. A T-score of -2.5 or below is a diagnosis of osteoporosis, eg. are T-scores of -2.6, -3.3 and -3.9. The lower the T-score that a person has, the lower their bone density is.