## Agct Standard Deviation

20 40 60 80 100 120 140 160 180

AGCT Score

20 40 60 80 100 120 140 160 180

### AGCT Score

Fig. 3-1. Standard score scales. These scales are based on the standard deviation. Note that a true T-score has very different units than the z-score.

A z-score or T-score can be calculated for any set of numerical data for which one can calculate the mean and SD. There is nothing inherent in the definition of these standard scores that limits their application to only a single kind of data. In bone densitometry, however, the T-score has undergone some modification and both the T-score and z-score have acquired specific characteristics that are quite distinct from their use in general statistics.

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