ACCURACY OF MEASURES OF FATNESS
The advantage of weight is that it is a simple, accurate and reliable measurement. The accuracy of any measure of body fatness, as with other physical and psychological tests, can be gauged in at least three ways; by its validity, reliability and sensitivity. Each of these are scored on a scale from 0 to 1.0, where 0 implies a low degree of accuracy and 1.0 a perfect measure.
Validity refers to the degree to which a measurement actually measures what it purports to. Without validity, any technique is useless.
Sensitivity refers to the degree to which the measurement instrument can detect subtle changes, and derive different scores as small changes occur.
Given these three factors, measures of fatness can then be rated for their usefulness in the practical situation. We have divided these into (a) manual measures, (b) machine measures of fatness, and 1 measures of body fat distribution.
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