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TABLE G-3 Mean and Percentiles for Serum Ferritin (μg/L), NHANES III (1988–1994)

Sex/Age Categorya

n

Mean

Percentile

5th

10th

Both sexes, 1–3 y

2,429

27.9

6.0

9.0

Both sexes, 4–8 y

2,906

34.1

14.3

17.0

Standard error

 

0.5

0.4

0.4

M 9–13 y

1,098

38.8

16.2

19.2

Standard error

 

1.1

0.7

1.3

M 14–18 y

837

56.6

20.0

24.0

Standard error

 

2.1

1.0

1.1

M 19–30 y

1,801

131.0

42.0

54.0

Standard error

 

2.5

3.2

6.0

M 31–50 y

2,418

189.4

41.0

60.0

Standard error

 

3.6

2.5

2.6

M 51–70 y

1,877

204.2

37.0

53.0

Standard error

 

6.8

2.5

3.1

M 71+ y

1,189

184.8

28.0

41.0

Standard error

 

6.4

1.7

1.9

F 9–13 y

1,092

36.4

12.3

16.0

Standard error

 

1.1

1.3

1.4

F 14–18 y

888

35.8

9.0

12.0

Standard error

 

2.9

1.0

1.0

F 19–30 years

1,797

47.8

9.0

13.0

Standard error

 

1.5

0.6

0.8

F 31–50 y

2,808

64.0

7.0

11.0

Standard error

 

3.1

0.4

0.6

F 51–70 years

1,980

120.1

19.0

28.0

Standard error

 

3.3

1.0

1.2

F 71+ y

1,300

135.1

21.0

30.0

Standard error

 

5.0

1.4

2.3

F Pregnant

320

37.6

12.0

15.0

Standard error

 

3.9

5.3

5.1

F Lactating

94

47.3

18.0

21.0

Standard error

 

6.1

5.6

6.1

F P/L

410

41.1

11.0

14.0

Standard error

 

3.3

1.7

2.1

All Individuals

24,420

104.3

12.0

18.0

Standard error

 

1.4

0.2

0.3

All Indiv (+P/L)

24,830

103.2

12.0

17.0

Standard error

 

1.4

0.2

0.3

NOTE: The intake distributions for 2–6 months, 7–11 months, and 1–3 years of age are unadjusted. Means and percentiles for these groups were computed using SAS PROC UNIVARIATE. For all other groups, data were adjusted using the Iowa State University method. Mean, standard errors, and percentiles were obtained using C-Side. Standard errors were estimated via jackknife replication. Each standard error has 49 degrees of freedom. Infants and children fed human milk and females who had “blank but applicable” pregnancy and lactating status data or who responded “I don’t know” to ques tions on pregnancy and lactating status were excluded from all analyses. Females who were both pregnant and lactating were included in both the Pregnant and Lactating categories. The sample sizes for the Pregnant and Lactating categories were very small so their estimates of usual serum ferritin distributions are not reliable.



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