FIGURE 3.

Estimated prevalence of inadequate intake of vitamin A, magnesium, folate, and vitamin E among adult men in the United States estimated by the NCI 1-d method with use of different inputs for the assumed within-person to between-person variance ratios. Error bars represent the standard error of the prevalence of inadequate intake. The solid vertical line represents the scenario in which the unbiased within-to-between variance ratio was used (that is, the ratio calculated from the same data set through use of the NCI amount-only method and 2 d of recalls). NCI, National Cancer Institute.