Final answer:
A T-score between +1 and -1 on a DXA scan signifies that the bone density is within the normal range and does not indicate significant bone loss or osteoporosis.
Step-by-step explanation:
On a Dual-Energy X-ray Absorptiometry (DXA), a T-score between +1 and -1 signifies that the bone density is within the normal range when compared to a healthy 30-year old adult. The T-score is a standard deviation score that tells you how much your bone density is above or below the average. A T-score within this range indicates that there are no significant bone density issues such as osteoporosis, which is generally of concern when the T-score is lower than -2.5. The concept of T-scores is similar to z-scores used in statistics, which describe how many standard deviations data points are from the mean. As with the z-scores, where about 68 percent of the values lie between z-scores of -1 and +1, a T-score in this range on a DXA scan is generally considered normal or average.