Published in Medical Letter on the CDC and FDA, January 21st, 2001
"Although age categorization may often have little effect on prevalence estimates, prevalence may sometimes be overestimated by as much as three percentage points. Use of narrower age categorizations than those used to construct the reference values may result in systematic biases," K.M. Flegal, of the U.S. Centers for Disease Control and Prevention, reported in a recent study published in the International Journal of Obesity.
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