Cover Image

PAPERBACK
$34.95



View/Hide Left Panel

Meets the Assumptions of the Cut-Point Method

Variance of Intake is Greater than Variance of Requirementb

Requirement Distribution Symmetricalc

Intake and Requirement Independent or Have Low Correlation

CV of the Requirementd (%)

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 data adequate to indicate otherwise.

dCV of the requirement is needed for the probability approach.

Figure 4-8 shows the same hypothetical (simulated) joint distribution of intakes and requirements for the group of individuals presented in Figure 4-2. The figure includes joint intake and requirement data from 3,000 people, with a mean intake of 1,600 units and a mean requirement of 1,200 units. As before, intakes and requirements are independent (i.e., individuals with higher intakes are not more likely to have higher requirements).

As discussed earlier, the proportion of the population with inadequate intakes could be obtained simply by counting the people who



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement