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Meets the Assumptions of the Cut-Point Method

Variance of Intake is Greater than Variance of Requirementb

Requirement Distributions Symmetricalc

Intake and Requirement Independent or Have Low Correlation

Coefficient of Variance of the Requirement Estimated (%)

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

15

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

Yes

Assumed

Yes

10

c Data to determine the shape of requirement distributions are lacking for most nutrients; therefore, symmetry is assumed unless there are adequate data indicating otherwise.

d The CV of the requirement estimate is needed for the probability approach.

Using the RDA Is Inappropriate for Assessing Groups

The Recommended Dietary Allowance (RDA), by definition, is an intake level that exceeds the requirements of 97 to 98 percent of all individuals when requirements in the group have a normal distribution. Thus, the RDA should not be used as a cut-point for assessing nutrient intakes of groups because a serious overestimation of the proportion of the group at risk of inadequacy would result.



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