1994 to 1996. NHANES III examined 30,000 subjects aged 2 months and older. A single 24-hour diet recall was collected for all subjects. A second recall was collected for a 5 percent nonrandom subsample to allow adjustment of intake estimates for day-to-day variation. NHANES III also collected various biochemical data on a subset of subjects. The 1994 to 1996 CSFII collected two nonconsecutive 24-hour recalls from approximately 16,000 subjects of all ages. Both surveys used the food composition database developed by USDA to calculate nutrient intakes (Perloff et al., 1990) and were adjusted by the method of Nusser et al. (1996). National survey data for Canada for these nutrients have been collected in 10 provinces.
Appendixes D and E provide the mean and the fifth through ninety-ninth percentiles of dietary intakes of sodium, potassium, and water from NHANES III and CFSII, adjusted by methods described by the National Research Council (NRC, 1986) and by Feinleib and coworkers (1993) and adjusted for day-to-day variation by the method of Nusser and coworkers (1996). Appendix F provides means and selected percentiles of dietary intakes for adults in 10 provinces.
For some nutrients, two types of information are provided about food sources: identification of the foods that are the major contributors of the nutrients to diets in the United States and Canada and identification of the foods that contain the highest amounts of the nutrient. The determination of foods that are major contributors depends on both nutrient content of a food and the total consumption of the food (amount and frequency). Therefore, a food that has a relatively low concentration of the nutrient might still be a large contributor to total intake if that food is consumed in relatively large amounts.
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