FIGURE 1.

Ratios of within-individual to total variance in nutrient intakes from publications or reanalyzed datasets. The total number of ratio estimates (points) and studies, respectively, represented by each boxplot are shown in parentheses on the vertical axis. Data include analyses on overlapping populations when combined and disaggregated analyses were performed by season, age, sex, or physiological status, or including and excluding the contribution of iron intake from cooking pots. Ratios for analyses including intake from supplements are not shown. “Folic acid” refers to the synthetic form found in fortified foods, while “folate” refers to natural dietary forms or dietary folate equivalents. WIV:total variance, ratio of within-individual to total variance.