Vitamin C Deficiency and Depletion in the United States: The Third National Health and Nutrition Examination Survey, 1988 to 1994
Jeffrey S Hampl, PhD, RD,
Christopher A. Taylor, PhD, RD and
Carol S. Johnston, PhD, RD
Jeffrey S Hampl and Carol S. Johnston are with the Department of Nutrition, Arizona State University, Mesa. Christopher A. Taylor is with the Department of Nutritional Science, Oklahoma State University, Stillwater.

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FIGURE 1— Mean vitamin C intakes, stratified by serum vitamin C levels.
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Copyright © 2004 by the American Public Health Association