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TABLE 4-1 Summary of Nutrients to Date with Dietary Reference Intakes (DRIs), and Whether They Meet the 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—the AI cannot be used with the EAR cut-point method; UL = Tolerable Upper Intake Level.

b Although there is little information on the variance of requirements, DRIs published to date have assumed a coefficient of variation ( CV) of 10 or 15 percent. Variance of intake as calculated from the Continuing Survey of Food Intakes by Individuals 1994– 1996 indicates that for all nutrients, intake variance is well above the assumed requirement variance.

with intakes below the median requirement (EAR). In the example used when discussing the probability approach, population prevalence according to the EAR cut-point method would be the proportion of individuals with usual intakes below 100 units, the EAR.

Figure 4-7 illustrates the EAR cut-point method. The shaded area corresponds to the proportion of individuals in the group whose intakes are less than the EAR and the unshaded area corresponds to the proportion with usual intakes greater than the EAR. A discussion of why this approach works follows.



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