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TABLE H-5 Lower and Upper Quartiles of Iron Intake from Food (mg/d) and Median Levels of Serum Ferritin (μg/L): Individuals Who Do Not Report Intake of Iron Supplements, NHANES III (1988–1994)

Sex/Age Categorya

Lower Quartile of Iron Intake

Upper Quartile of Iron Intake

Median of Estimated Usual Iron Intake from Food

Median of Observed Serum Ferritin Levels

Median of Estimated Usual Iron Intake from Food

Median of Observed Serum Ferritin Levels

Both sexes, 1 to 3 y

4.6

21.0

16.3

23.5

Both sexes, 4 to 8 y

9.4

29.0

16.9

30.0

M 9 to 13 y

10.4

35.0

21.6

33.0

M 14 to 18 y

12.8

48.0

26.9

50.0

M 19 to 30 y

13.2

111.0

23.6

105.0

M 31 to 50 y

12.6

168.0

24.4

163.0

M 51 to 70 y

10.0

160.0

23.6

148.0

M 71+ y

8.3

148.0

25.1

134.0

F 9 to 13 y

10.5

29.0

16.4

31.0

F 14 to 18 y

7.8

28.0

16.5

25.0

F 19 to 30 y

9.9

33.0

15.4

31.0

F 31 to 50 y

8.4

43.0

16.9

40.0

F 51 to 70 y

7.3

102.0

17.0

93.5

F 71+ y

7.4

107.5

16.9

87.0

F P/L

10.8

32.0

21.1

28.5

All Individuals

9.2

51.0

19.6

49.0

All Individuals (+P/L)

9.2

51.0

19.6

49.0

NOTE: The iron intakes used for constructing the lower and upper quartiles were estimated using the Iowa State University method. Computations of the medians were completed with the C-SIDE program. Children fed human milk and females who had “blank but applicable” pregnancy and lactating status data or who responded “I don’t know” to questions on pregnancy and lactating status were excluded from all analyses.

a M = male, F = female, P/L = pregnant and lactating.

SOURCE: ENVIRON International Corporation and Iowa State University Department of Statistics, 1999.



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