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TABLE S-1 Summary of Dietary Reference Intakes (DRIs) for Nutrients and Assumptions Necessary to Apply the Estimated Average Requirement (EAR) Cut-Point Method for Assessing the Prevalence of Inadequacy for Groups

 

Established DRIsa

Nutrient

EAR

RDA

AI

UL

Magnesium

+

+

 

+

Phosphorus

+

+

 

+

Selenium

+

+

 

+

Thiamin

+

+

 

Riboflavin

+

+

 

Niacin

+

+

 

+

Vitamin B6

+

+

 

+

Folate

+

+

 

+

Vitamin B12

+

+

 

Vitamin C

+

+

 

+

Vitamin E

+

+

 

+

Calcium

 

+

+

Fluoride

 

+

+

Biotin

 

+

 

Choline

 

+

+

Vitamin D

 

+

+

Pantothenic Acid

 

+

 

a RDA = Recommended Dietary Allowance; AI = Adequate Intake, cannot be used with the cut-point method; UL = Tolerable Upper Intake Level.

b Due to little information on the variance of requirements, published DRIs have assumed a coefficient of variation (CV) of 10 percent unless data for a specific nutrient demonstrate a greater variability. Variance of intake, as calculated from the 1994–1996 Continuing Survey of Food Intake by Individuals, indicates that for all nutrients intake variance is well above the assumed requirement variance.

If intake distributions are not properly adjusted both for within-person variation and survey-related effects such as interview method and interview sequence, the prevalence of nutrient inadequacy will be incorrectly estimated no matter which of the methods discussed earlier is chosen. If only one day of intake data is available for each individual in the sample, it may still be possible to adjust the observed intake distribution by using an estimate of within-person variation in intakes estimated from other data sets.



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