How is the T-score determined?
How is the T-score determined?
The formula for the t score is the sample mean minus the population mean, all over the sample standard deviation divided by the square root of the number of observations.
What does age matched mean in bone density test?
The age-matched reading, known as the Z-score, compares a person’s bone density to what is expected in someone of equivalent age, sex, and size. However, among older and elderly adults, low bone mineral density is common, so comparison with age-matched norms can be misleading.
What does a T-score of indicate?
A T-score of -1 to 0 and above is considered normal bone density. A T-score between -1 and -2.5 is diagnosed as osteopenia. A score of -2.5 or below is diagnosed as osteoporosis.
When do you use T-score and Z-score in osteoporosis?
DEXA scores are reported as “T-scores” and “Z-scores.” The T-score is a comparison of a person’s bone density with that of a healthy 30-year-old of the same sex. The Z-score is a comparison of a person’s bone density with that of an average person of the same age and sex.
What do T scores mean in osteoporosis?
A T-score between −1 and −2.5 indicates that you have low bone mass, although not low enough to be diagnosed with osteoporosis. A T-score of −2.5 or lower indicates that you have osteoporosis. The greater the negative number, the more severe the osteoporosis.
Is a T-score bad?
Osteoporosis — People with osteoporosis have a T-score of -2.5 or less. Larger numbers (eg, -3.0) indicate lower bone density because this is a negative number. The lower the bone density, the greater the risk of fracture….GRAPHICS.
| T-score | Bone density |
|---|---|
| +1 to –1 | Normal bone density |
Is a T-score of normal?
As shown in the table below, a T-score between +1 and −1 is considered normal or healthy. A T-score between −1 and −2.5 indicates that you have low bone mass, although not low enough to be diagnosed with osteoporosis. A T-score of −2.5 or lower indicates that you have osteoporosis.
What is the difference between the mean and the T-score?
The results for the entire population will be distributed around an average score (the mean). A T-score is a standard deviation — a mathematical term that calculates how much a result varies from the average or mean. The score that you receive from your bone density (BMD or DXA) test is measured as a standard deviation from the mean.
What is the T-score of an average 30 year old?
If you are exactly equal to the peak bone mass of an average 30-year-old, you do not deviate at all from the average so your T-score would be 0 standard deviations (SD). If your bones are stronger than the average adult, your bone mass may be +1 or +2 SD indicating that your bones have a mass 10–20% above that of the average 30 year old.
What does the T-score on my bone density report mean?
The T-score on your bone density report shows how much your bone mass differs from the bone mass of an average healthy 30 year old adult. A bone density test is like any other medical test or measurement. The results for the entire population will be distributed around an average score (the mean).
Why is my T-score 0 standard deviation?
One standard deviation is equal to a 10–12% difference in bone mass. If you are exactly equal to the peak bone mass of an average 30-year-old, you do not deviate at all from the average so your T-score would be 0 standard deviations (SD).
