TABLE B-1 Illustrative Calculations of Population-Weighted Estimated Average Requirements (EARs) for Persons 4 Years of Age and Older Using 2005 U.S. Population Figures and of the Highest EAR for Each Nutrient (Nonweighted)

Nutrienta

Median Weighted EAR

Percent Within 20%b

Percent Within 30%c

Highest EARd

Percent Within 20%e

Percent Within 30%f

Vitamin A (μg RAE)

529

54

72

630

51

71

Vitamin C (mg)

63

65

79

75

60

80

Vitamin E (mg α-tocopherol)

12

83

91

12

84

91

Thiamin (mg)

0.9

80

90

1.0

78

89

Riboflavin (mg)

1.0

73

88

1.1

67

87

Niacin (mg)

11

70

86

12

71

86

Vitamin B6 (mg)

1.1

69

83

1.4

51

77

Folate (μg DFE)

314

84

92

330

84

91

Vitamin B12 (μg)

2.0

83

91

2.0

84

91

Copper (μg)

684

84

92

700

84

91

Iodine (μg)

93

85

95

95

85

94

Iron (mg)

6.1

59

77

8.1

39

64

Magnesium (mg)

286

60

79

350

53

75

Molybdenum (μg)

33

84

92

34

84

91

Phosphorus (mg)

588

75

81

1,055

14

15

Selenium (μg)

44

84

92

45

85

92

Zinc (mg)

7.5

61

79

9.4

48

75

NOTE: Population subgroup proportions for this table were computed using the U.S. Census Bureau middle series of the national population projections (Population Projections Program, 2000). The source data, which give the age distribution for each age and gender, were aggregated in concordance with the Dietary Reference Intakes age and gender categories.

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

bEstimated percentage 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.

dExcludes EARs for pregnant and lactating women.

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

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



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