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TABLE 9-10 Summary Illustration of Median Absorbed Iron Requirements for Children and Adolescents, Aged 9 through 18 Yearsa

 

Components of Iron Needs

Age (y)

Median Weightb (kg)

Change in Hemoglobin Mass (mg/d)

Basal Loss (mg/d)

Tissue Deposit (mg/d)

Storage (mg/d)

Menses (mg/d)c

Boys

9

32.5

0.45

0.48

0.002

0

0

10

36.6

0.50

0.49

0.002

0

0

11

40.0

0.62

0.50

0.002

0

0

12

48.1

0.65

0.51

0.002

0

0

13

52.3

0.75

1.05

0.004

0

0

14

61.2

0.75

1.18

0.004

0

0

15

62.0

0.80

0.43

0.001

0

0

16

66.5

0.78

0.44

0.001

0

0

17

69.9

0.84

0.46

0.001

0

0

18

68.3

0.81

0.16

0

0

0

Girls

9

31.9

0.45

0.40

0.002

0

0b

10

35.8

0.50

0.41

0.002

0

0b

11

44.0

0.63

0.42

0.002

0

(0.45)b

12

46.3

0.65

0.63

0.003

0

(0.45)b

13

53.5

0.75

0.64

0.003

0

(0.45)b

14

53.4

0.75

0.14

0.001

0

0.45

15

56.9

0.80

0.14

0.001

0

0.45

16

55.6

0.78

0.14

0.001

0

0.45

17

60.0

0.83

0.15

0.001

0

0.45

18

58.0

0.81

0.10

0

0

0.45

a Summation of the median iron components and dividing by 18 percent bioavailability does not yield values that are equivalent to the 50th and 97.5th percentile data shown in Appendix Table I-3. This is because the summation of the median of non-normal distributions (above) do not yield the median of simulation models that represent normalized data.

b Third National Health and Nutrition Examination Survey data (not demographically weighted).

c The model assumes that all girls are menstruating at age 14.0 years and after; it also assumes that no girls reach menarche before age 14. This is not a valid assumption. In working with individuals, menstrual status can be ascertained and an adjustment can be made.



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