TABLE B-6 Illustrative Calculations of Population-Weighted Estimated Average Requirements (EARs) and of Highest EAR for Nutrients for Lactating Women in the United States

Nutrienta

Median Weighted EAR

Percent Within 20%b

Percent Within 30%c

Highest EAR

Percent Within 20%d

Percent Within 30%e

Vitamin A (μg RAE)

899

68

87

900

68

87

Vitamin C (mg)

100

95

99.7

100

95

99.7

Vitamin E (mg α-tocopherol)

16

95

99.7

16

95

99.7

Thiamin (mg)

1.2

95

99.7

1.2

95

99.7

Riboflavin (mg)

1.3

95

99.7

1.3

95

99.7

Niacin (mg)

13

82

95

13

82

95

Vitamin B6 (mg)

1.7

95

100

1.7

95

100

Folate (μg DFE)

450

95

99.7

450

95

99.7

Vitamin B12 (μg)

2.4

95

99.7

2.4

95

99.7

Copper (μg)

999

95

99.7

1,000

95

99.7

Iodine (μg)

209

95

99.7

209

95

99.7

Iron (mg)

6.5

95

99.7

7.0

92

99

Magnesium (mg)

260

94

99

300

77

97

Molybdenum (μg)

36

95

99.7

36

95

99.7

Phosphorus (mg)

583

92

96

1,055

3.6

4.1

Selenium (μg)

59

95

99.7

59

95

99.7

Zinc (mg)

10.4

95

99.7

10.9

94

99.6

NOTE: Computations are based on approximation. Proportion of lactating women for each age group was assumed to be the same as the proportion of pregnant women (proportion of births stratified by mother’s age in three age groups: 18 y, 19–30 y, 31–50 y) using data from Ventura and colleagues (2003).

aRAE = retinol activity equivalents, DFE = dietary folate equivalents.

bEstimated proportion of the population with a requirement within 20% of the population-weighted EAR.

cEstimated proportion of the population with a requirement within 30% of the population-weighted EAR.

dEstimated proportion of the population with a requirement within 20% of the highest EAR.

eEstimated proportion of the population with a requirement within 30% of the highest EAR.



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