Dietary Reference Intakes: Applications in Dietary Assessment

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Dietary Reference Intakes: Applications in Dietary Assessment (2000)
Institute of Medicine (IOM)

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. "3 Using Dietary Reference Intakes for Nutrient Assessment of Individuals." Dietary Reference Intakes: Applications in Dietary Assessment. Washington, DC: The National Academies Press, 2000.

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DRI DIETARY REFERENCE INTAKES: Applications in Dietary Assessment

TABLE 3-1 Illustration of Observed Mean Intakes of Magnesium That Would Be Necessary to Have 85 Percent or 97.5 Percent Confidence That Usual Intake Is Greater Than the Requirement for a Woman 40 Years of Age

	Using SD of Intake from CSFII^a		Assuming the SD is 25 Percent Larger		Assuming the SD is 50 Percent Larger
	mg	% RDA^b	mg	% RDA	mg	% RDA
Magnesium EAR^c	265		265		265
SD of requirement	26.5		26.5		26.5
Magnesium RDA	320		320		320
Assumed SD of intake^d	86		107		129
Observed mean intake with 85 % confidence of adequacy of usual intake
1 d of intake	355	111	376	117	397	124
3 d of intake	321	100	332	104	344	107
7 d of intake	307	96	313	98	320	100
Observed mean intake with 97.5 % confidence of adequacy of usual intake
1 d of intake	445	139	486	152	528	165
3 d of intake	377	118	400	125	423	132
7 d of intake	349	109	362	113	376	117
NOTE: Observed mean intake with xx percent confidence of adequacy = observed mean intake necessary to have approximately xx percent confidence that the woman's intake is greater than her requirement. ^a SD = standard deviation; CSFII = Continuing Survey of Food Intake by Individuals. ^b RDA = Recommended Dietary Allowance for women 31 through 50 years of age ^c EAR = Estimated Average Requirement for women 31 through 50 years of age. ^d SD of magnesium intake for women 19 through 50 years of age taken from CSFII (Appendix Table B-2).

is not the best estimate of the individual's SD of daily intake, the Subcommittee still recommends its use in individual assessment.

Table 3-1 expands this example to further illustrate the effect of day-to-day variation on the evaluation of magnesium intake for a woman in the 31–50 years age group.

For a given confidence level, the number of days of intake data affects the level of nutrient intake judged to be adequate. Based on the SD in intake of 85.9 mg/day for an individual (again using the information in Appendix Table B-2), observed intake would need