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DRI DIETARY REFERENCE INTAKES: Applications in Dietary Assessment
TABLE B-1 Values for the Ratio D/SDD and Corresponding Probability of Correctly Concluding that Usual Intake Is Adequate or Inadequate
Criterion
Conclusion
Probability of Correct Conclusion
D/SDD> 2.00
Usual intake is adequate
0.98
D/SDD> 1.65
Usual intake is adequate
0.95
D/SDD> 1.50
Usual intake is adequate
0.93
D/SDD> 1.00
Usual intake is adequate
0.85
D/SDD> 0.50
Usual intake is adequate
0.70
D/SDD> 0.00
Usual intake is adequate (inadequate)
0.50
D/SDD< −0.50
Usual intake is inadequate
0.70
D/SDD< −1.00
Usual intake is inadequate
0.85
D/SDD< −1.50
Usual intake is inadequate
0.93
D/SDD< −1.65
Usual intake is inadequate
0.95
D/SDD< −2.00
Usual intake is inadequate
0.98
SOURCE: Adapted from Snedecor and Cochran (1980).
and is only approximate. The assumptions that are implicit in the criterion include:
The distribution of daily intakes Y around the mean intake is approximately normal, or at least symmetrical, for the individual. Any nutrient with a skewed distribution of daily intakes would not satisfy this assumption, such as those nutrients in Table B-2, Table B-3, Table B-4 through Table B-5 with a CV larger than about 60 to 70 percent.
The distribution of requirements in the group is approximately normal.
The daily intake Y accurately reflects the individual's true intake of the nutrient for the day.
A reliable estimate of the day-to-day variability in intake for the individual is available.
Intakes are independent of requirements.
In probabilistic terms, the value of 1 for the ratio D/SDD corresponds to an approximate 0.15 p-value for the test of the hypothesis that y > ρ. That is, when it is concluded that intake is adequate, there is approximately an 85 percent chance of reaching the correct conclusion and approximately a 15 percent chance of making a mistake (erroneously concluding that intake is adequate). Because the criterion is formulated on this probabilistic basis, the level of
is approximately normal, or at least symmetrical, for the individual. Any nutrient with a skewed distribution of daily intakes would not satisfy this assumption, such as those nutrients in 