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. 1996 Dec 10;93(25):14344–14348. doi: 10.1073/pnas.93.25.14344

Figure 1.

Figure 1

Histograms of estimated distributions of usual intakes of vitamin C (mg per day) among adult men 20–50 years of age living in the Netherlands (A) or in the United States (B). Median intakes are marked by the arrowheads. Data were taken from ref. 12 and from the most recent U.S. Department of Agriculture Continuing Study of Food Intake by Individuals (CSFII-1994) (13). Reported intake data were adjusted by the method developed at Iowa State University (17) to estimate the distributions of usual intakes. Intake intervals were set at 10 mg per day and they have been joined for presentation purposes. The 60 mg RDA recommended by FNB/NRC and the 200 mg RDA proposed by Levine et al. (3) are shown within each distribution.