TABLE B-5 Illustrative Calculations of Population-Weighted Estimated Average Requirements (EARs) and of the Highest EAR for Nutrients for Pregnant 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)

549

68

87

550

68

87

Vitamin C (mg)

70

95

99.7

70

95

99.7

Vitamin E (mg α-tocopherol)

12

95

99.7

12

95

99.7

Thiamin (mg)

1.2

95

99.7

1.2

95

99.7

Riboflavin (mg)

1.2

95

99.7

1.2

95

99.7

Niacin (mg)

14

82

95

14

82

95

Vitamin B6 (mg)

1.6

95

100

1.6

95

100

Folate (μg DFE)

520

95

99.7

520

95

99.7

Vitamin B12 (μg)

2.2

95

99.7

2.2

95

99.7

Copper (μg)

799

95

99.7

800

95

99.7

Iodine (μg)

160

95

99.7

160

95

99.7

Iron (mg)

22

95

99.7

23

94

99.6

Magnesium (mg)

295

94

99

335

81

98

Molybdenum (μg)

40

95

99.7

40

95

99.7

Phosphorus (mg)

583

92

96

1,055

3.6

4.1

Selenium (μg)

49

95

99.7

49

95

99.7

Zinc (mg)

9.5

95

99.6

10.5

88

99

NOTE: Computations are based on 2001 estimates (Ventura et al., 2003) of the number of pregnant women comprised of three age groups: 18 y, 19–30 y, 31–50 y.

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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