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However, the accuracy of this method varies greatly based on the user's abilities. Bioelectrical impedance analysis, the other common method, is the technology behind the many fat percentage scales sold for home use. "The error rates for these can be as high as 8%, plus or minus," says DuVal. "Other accu measure methods are highly accurate but much more complicated, like X-ray analysis, water displacement, and others. That's why BMI accu measure has its place in weight management. It may be crude, but it does give you a good idea of risk quickly and easily." DuVal says that fat-percentage measurement, despite accu measure the inaccuracies, can be useful. "In terms of ease-of-use and usefulness, the BMI can't be beat," he says. "But if a home, fat-measurement device helps someone stay focused on their diet and exercise level and motivated to stay healthy, then I think the device has a place in weight management." Published Nov. 25, 2002. SOURCES: Centers for Disease Control and Prevention • American Council on Exercise • Tammy Callahan, marketing manager, Life Measurement Inc.
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