— 

FROM VITAL & HEALTH STATISTICS OF THE NATIONAL CENTER FOR HEALTH STA TLSTICS 

U.S. DEPARTMENT OF HEALTH, EDUCATION, AND WELFARE - Public Health Service I Number 46 = January 26, 1.979 

Hemoglobin and Selected Iron-Related Findings of 

Persons 1-74 Years of Age: United States, 1971-74a 

This report presents selected findings of the 

hemoglobin, serum iron, and percent transferring 

sat u ration determinations collected in the 

Heal th and Nutrition Examination Survey 

(HANES). The serum iron and transferring saturation results supersede all previously published results. 1>2 

HANES is a program of the National Center 

for Health Statistics in which measures of nutritional status are collected for a scientifically 

designed sample representative of the civilian 

noninstitutionalized population of the United 

States aged 1-74 years.3 

The data collected from April 1971 through 

June 1974 are based on the examination of 

20,749 persons from a total of 28,043 persons 

aged 1-74 years who were selected in the national probability sample to represent the 194 

million persons in that age group in the civilian 

n o ninstitutionalized population. This was a 

response rate of 74 percent or an effective response rate of 75 percent when adjustment is 

made for the effect of oversampling among the 

poor, preschool children, women of childbearing 

age, and the elderly. 

DetaiIed estimates of the distributions of 

iron-related measurements and the prevalence 

and distribution of iron deficiency anemia in the 

United States will be described in a forthcoming report4 in Series 11 of the Vital and 

Health Statistics. 

B1ood specimens were collected primarily 

by using venipuncture procedures. When these 

aThis report was prepared by Clifford L. Johnson, 

procedures were unsuccessful, a finger stick 

technique was used to obtain blood samples 

from which the hematological determinations 

could be made. For children aged 1-3 years, 

a large proportion of the specimens were collected by the finger stick technique. The numbers of 

blood specimens colIected by this technique for 

persons aged 3 years and over were very smzdl. 

AH hemoglobin concentrations for HANES 

were determined on the CouIter Hemoglobinometer in the mobile examination center. The 

procedure is based on the hemoglobincyanide 

(cyanmethemoglobin, HbCN) pnnciple.5 Serum 

iron and total iron-binding capacity determinations were made by the Nutritional Biochemistry Section, ClinicaI Chemistry Division, 

Bureau of Laboratories, Center for Disease Control, Atlanta, Ga. The analytical method was a 

modification of the Technicon AutoAnalyzer 

II-25 method based on the procedures of 

Giovanniello, et al- and Ramsey.5 

Following the publication of the “Preliminary Findings of the First HeaIth and Nutrition 

Examination Survey, United States, 1971-1972: 

Dietary Intake and Biochemical Findings,’>l a 

different analytical method for measuring serum 

iron and total iron-binding capacity5 was 

adopted for the remainder of HANES. Although 

based on the same ana.lyticaI principles applied 

in the origimd method of White and Flaschka,6 

the AutoAnalyzer method includes a dialysis 

procedure. A comparison study of the original 

and the AutoAnalyzer methods revealed unacceptable variability in the iron and total ironbinding capacity results obtained with the original method. For persons whose sera were � processed using the original method, portions of

M. S.P.H. and Sidney Abraham, Dhision of Health Examination Statistics. 

9 
the same serum specimens were taken from a 

reserve vial collection stored at -20° C and were 

reanalyzed by the AutoAnalyzer method between December 1974 and May 1975. As previously noted, these data for serum iron and 

transfernn saturation results supersede all previously published results. 1~z 

Except for children aged 1-3 years, a sufficient number of serum iron and percent transfernn measurements are available for presenting 

results for all persons 4-74 years of age. The 

number of missing measurements for children 

aged 1-3 years was large. Although results are 

presented, no attempt was made to analyze the 

data on persons of these ages because of possible 

bias due to the missing values. The number of 

missing hemoglobin concentrations was small for 

all age groups, and results are analyzed for all 

persons aged 1-74 years. 

PRINCIPAL FINDINGS 

Hemoglobin 

The mean hemoglobin level for males increased with age from 11.9 g/all at age 1 year to 

15.8 g/all at ages 18-19 years. It remains fairly 

constant at ages 18-54 years and declines slightly 

at the older ages to a value of 15.3 g/all at ages 

65-74 years (table 1, figure 1). 

A different pattern was observed for females, where the mean hemoglobin level increased with age from 12.0 g/all at age 1 year to 

a maximum value of 14.1 g/all at ages 55-64 

years, Then the level dipped slightly to 14.0 g/all 

in the age group 65-74 years (table 2, figure 1). 

The differences in mean hemoglobin level 

for males and females increased with age. For 

Figure	 1. MEAN HEMOGLOBIN LEVELS FOR PERSONS AGED 1.74 

YEARS, BY AGE ANO SEX UNITED STATES, 1971-74 

18


17 [ 

“~ 6.11 12-17 18-19 20.24 25.34 35.44 45.54 55.64 65.74 

AGE 

example, the differences at ages 1-11 years were 

small-ranging from 0.0 to 0.2 g/all (tables 1 and 

2). However, at ages 12 years and over the mean 

hemoglobin levels for males were consistently 

higher than those for females, These differences 

ranged from 1.0 g/all at ages 12-17 years to 2.2 

g/dI at ages 18-24 years (tables 1 and 2). 

The hemoglobin pattern observed previously 

for the total male population aged 1-74 years 

was similar to the ones observed for white males 

and black males separately (table 1, figure 2). 

Mean levels generally increased with age to ages 

18-19 years, remained reasonably constant to 

ages 45-54 years, and then declined at ages 

55-74 years. 

The age-hemoglobin pattern for the female 

population was similar in aIl three categories–all 

races, white females, and black females. For 

example, the pattern for white females was 

similar to the pattern observed for the total 

female population, generally increasing from 

12.0 g/all at age 1 year to 14.2 g/dI at ages 55-64 

years, and declining slightly to 14.1 g/all at ages 

65-74 years. Black females also generally followed the same pattern as the total female population, reaching a high value of 13.5 g/all at ages 

45-54 years and declining to 13.1 g/all at ages 

65-74 years (table 2, figure 3). 

For all ages, white males had higher mean 

hemoglobin levels than bIack males (table 1 and 

figure 2). Similarly, mean hemoglobin levels for 

white females were consistently higher than 

those for black females at all ages (table 2, figure 

3). A detailed analysis of the hemoglobin data 

for females of reproductive ageT reveals that this 

mean difference between the races is not explained by differences in iron nutriture as 

measured by transferring saturation values. 

Figure 2. MEAN HEMOGLOBIN LEVELS FOR MALES AGED 1-74 

YEARS, BY AGE AND RACE UNITED STATES, 1971-74 

16 

17 E 

16 -

g 15 -

g 14 -

m 13 - Cj 

: 12 -

z 11 - j White _ 

z 10- Black . . . . . . . . . 

“~ 6.11 12.17 16.19 20.24 25.34 35-44 45-54 65.64 65.74 

0 
— advancedata 3

Figure 3. MSAN HEMOGLOBIN LEVELS FOR FEMALES AGED 1-74 

YEARS, BY AGE AND RACE UNITED STATES, 1971-74 

18-

17 -

16 - = 

~ 15 -

; 14 -


g 13 - . . . . . . . . . . . . . . . . . ..- . . ..”””””’””. . . . . . . . . . . .


g 12 -


~ 11 - White —


= 10 - Black .. . . . . . . .


o~ 

1 45 611 12-17 16-19 2024 25-34 3547 45.54 55.64 65-74 

AGE 

Serum Iron 

Mean serum iron levels for males increased 

from 86.3 pg/dl at ages 4-5 years to 119.4 pg/dl 

at ages 18-19 years. Thereafter, the mean levels 

decreased with age to a low value of 102.4 pg/cU 

at ages 55-64 years, and then increased to 107.7 

pg/d at ages 65-74 years (table 3, figure 4). 

Table 4 and figure 4 show that the mean serum 

iron levels for females increased with age from 

89.4 pg/dl at ages 4-5 years to a high value of 

106.2 pg/dl at ages 20-24 years. The mean Ievels 

then decreased irregularly to a low of 97.6 pg/dI 

at ages 65-74 years. Although females had higher 

mean serum iron values than males at the younger ages, these differences were smalI. The differences in meam values were 3.1 ~g/dl at ages 

4-5 years and 2.0 pg/dl at ages 6-11 years. This 

pattern was reversed at ages 12-74 years, with 

males having consistently higher mean serum 

iron levels.” These differences were larger– 

Figure 4. MEAN SERUM [RON LEVELS FOR PERSONS AGED 1-74 

YEARS, BY AGE AND SEX UNITED STATES, 1971-74 

120-

110 -

> 100 -

Q 

g 

=W -

Males — 

a


H To Females . . . ..-


1 1 1 r ! ! I I ‘r’’” 1 45 611 ! 12-17 l&19 2@24 2534 35-44 4534 55.646574[ 

I AGE 

Figure 5. MEAN SERUM IRON LEVELS FOR MALES AGED 1-74 

YEARS, BY AGE AND RACE UNITED STATES, 1971-74 

120 -

110 -

100 -

= 2+ 

s 90 -

z : 

0 

2 

K Whim — % 70 -

; Black .s..-.., 

60 1“: 

o~ 1 45 0-11 12-17 l&lEl 20.2425-34 35-44 45.54 55-64 65.74 

AGE 

ranging from 1.2 ~g/dl at ages 55-64 years to 

18.1 pg/dl at ages 18-19 years (tables 3, 4, and 

figure 4). 

Mean serum iron levels for males did not folIow the same pattern as that for females. The 

levels for bIack males and white males increased 

with age from ages 4-5 years to 18-19 years and 

then generally decreased at ages 20-74 years but 

with no consistent pattern (tabIe 3, figure 5). 

For white females and bIack females, however, 

the highest mean serum iron levels were observed at ages 20-24 years, 106.9 pg/dI and 

103.2 ~g/dl respectively. At ages 25-74 years the 

mean leveIs decreased irregularly for both black 

and white females (table 4, figure 6). 

With two exceptions, the white population 

had higher mean serum iron leveIs than the bIack 

Figure 6. MEAN SERUM IRON LEVELS FOR FEMALES AGED 1-74 

YEARS, BY AGE AND RACE UNITED STATES, 1971-74 

Black . . . . 

60 I 

o~ 

1 45 6-11 12-1716-19 2U24 2&34 3544 45.54 65-64 65.74 
F

� 

4 dvmCwhh — 

Figure 7. MEAN PERCENT TRANSFERRINGSATURATION LEVELS 

FOR PERSONS AGED 1-74 YEARS, By AGE AND SEX 

UNITED STATES, 1971-74 

35r 

F Male — ~ 15


z


a Female a---. . . . . .
 a 

+ 10-

“~ 1 4-5 S11 12-17 16.19 2024 2S34 3544 45+4 55-64 65-74 

AGE 

population did. One exception was at ages 25-34 

years, where black males had higher mean levels 

than white males. The second e;ception was at 

ages 12-17 years where black females had higher 

levels than white females did. 

Percent Transferring Saturation 

The patterns observed for mean serum iron 

levels were also found for mean percent transfigure 8. MEAN PERCENT TRANSFERRINGSATURATION LEVELS 

FOR MALES AGED 1-74 YEARS, BY AGE AND RACE UNITED 

STATES, 1971-74 

o~ 1 4-5 6-11 12.17 li3.19 2&24 25-W 35-44 45.54 55-64 6574 

Figu@ 9.-MEAN PERCENT TRANSFERRIN.SAWMIION LEVELS 

‘— FOR FEMALES AGED- 1-7A- ~IAR~ &Y AGE AND RACE: 

UNITED ——- STATES .. . . . . .._ 1971-74

35 r 

White — 

Black — 

E 

‘o	 ! 1 I ! 1 I ! 1 ! ! I I 1 1 4.5 6-11 12-17 16-19 20124 25.34 35-44 45.54 5564 65.74 

AGE 

fernn saturation levels, Mean percent transferring 

saturation levels for males increased with age 

from 23.3 percent at ages 4-5 years to a high, 

value of 32.8 percent at ages 18-19 years. The 

mean values then decreased irregularly to 29.8 

percent at ages 55-64 years and increased again 

to 32.5 percent at ages 65-74 years (table 5, 

figure 7). The mean percent transfernn saturation level for females also increased with age 

from 24.5 percent at ages 4-5 years to 29.2 percent at ages 55-64 years. At ages 65-74 years 

there was a slightly lower mean value of 28.6 

percent (table 6, figure 7). 

Mean percent transferring saturation levels for 

females were higher than those for males at ages 

4-11 years. At all other ages, rnziles had higher 

mean levels than females, ranging from 0.6 percent at ages 55-64 years to 6.0 percent at ages 

18-19 years (tabIes 5, 6, and figure 7). In a 

pattern similar to that for serum iron, and with 

few exceptions, mean percent transferring saturation levels were higher for white males than for 

black males and for white females than for black 

females (figures 8 and 9). 

,/ 
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— a&meckh5

Table 1. Hemoglobin levels of males aged 1-74 yeara, sample size, eatimsted population in thousands,mean,
 standard deviation, standard error of the mean, and selected percentiles, by race and age: United States,


1971-74


Estimated Standard Percentile~


Sample population Standard


size in Mean! deviation] Race and age
 error of


All racea


1 year


2 years


3 years


4-5 years


6-11 years--------
 12-17 years


18-19 years


20-24 years


25-34 years


35-44 years


45-54 years


55-64 years-------
 65-74 years


White 

1 year------------ 2 years----------- 3 years 

4-5 yeara 

6-11 years 

12-17 years 

18-19 years------- 20-24 years 

25-34 years------- 35-44 years 

45-54 years------- 55-64 years 

65-74 years-------

Black


1 year------------
 2 years-----------
 3 years


4-5 years---------
 6-11 years


12-17 years-------
 18-19 years


20-24 years


25-34 years


35-44 yeara


45-54 years


55-64 years


65-74 years-------


lg/dl


the mean
 thousands 5th 10th 25th 50th 75th 90th 95th


272 

283 ~ 294 

1,811 

1,778 

1,802 

11.9 

12.3 

12.6 

1.7 

1.1 

1.1 

.08 

.09 

.09 

1;:: 

11.0 J:; 

11.3 

11.2 

11.6 

11.9 

12.1 

12.4 

12.5 

13.0 

13.0 

13.1 

13.6 

13.7 

13.8 

13.9 

14.0 

14.3 

549, 3,427 12.7 1.0 .07 11.2 11.5 12.1 12.7 13.3 14.0 14.4 

974 11,819 13.2 1.0 .05 11.7 12.0 12.6 13.3 13.9 14.4 14.8 

1,006 12,558 14.6 1.3 .06 12.5 13.0 13.7 14.5 15.5 16.4 16.7 

246 3,667 15.8 1.1 .06 14.0 14.3 15.1 15.9 16.5 17.2 17.6 ;:: 8,088 15.8 1.1 .06 14.0 14.6 15.1 15.8 16.5 17.0 17.4 

12,991 15.7 .07 13.9 14.3 15.1 15.8 16.4 17.1 17.5 

631 10,663 15.6 ::1 .06 13.9 14.2 15.0 15.6 16.3 17.0 17.5 

740 11,195 15.8 1.3 .05 13.9 14.3 15.0 15.8 16.6 17.4 17.9 

569 8,971 15.4 1.4 .06 13.2 13.8 14.7 15.5 16.2 17.0 17.6 

1,581 5,470 15.3 1.4 .04 13.0 13.6 14.5 15.3 16.2 16.9 17.4 

199 1,502 12.2 1.5 .09 10.2 11.5 12.3 13.1 13.7 14.0 

205 1,500 12.4 1.0 .11 1::2 10.8 11.8 12.4 13.1 13.8 14.1 

220 1,513 12.6 1.1 .10 11.0 11.4 11.9 12.5 13.1 13.8 14.4 

419 2,893 12.8 1.0 .07 11.3 11.6 12.1 12.7 13.5 14.1 7-4.4 

734 10,017 13.3 .06 11.9 12.2 12.7 13.4 13.9 14.4 14.8 

769 10,752 14.7 R .06 12.9 13.2 13.8 14.6 15.6 16.4 16.7 

195 3,173 15.9 1.0 .06 14.2 14.7 i5.3 15.9 16.5 17.2 17.6 

407 7,077 15.9 1.0 .07 14.3 14.7 15.3 15.9 16.5 17.1 17.5 

642 11,601 15.8 1.2 .07 13.9 14.3 15.1 15.9 16.5 17.2 17.5 

543 9,501 15.7 1.2 .07 13.9 14.3 15.0 15.6 16.3 16.9 17.5 

607 10,096 15.8 1.2 .05 14.0 14.4 15.1 15.8 16.6 17.4 17.8 

484 8,169 15.4 1.3 .06 13.2 13.8 14.7 15.5 16.3 17.0 17.6 

1,293 4,948 15.4 1.3 .04 13.2 13.8 14.6 15.5 16.3 16.9 17.4 

70 298 10.6 2.0 .21 6.8 11.1 12.2 12.7 12.8


74 260 11.7 1.4 .10 1;:: 1;:: 12.0 12.6 13.2 13.2


230 12.5 1.0 .14 1;:; 11.2 12.0 12.5 13.1 13.7 13.7


1:; 508 12.2 1.0 .11 10.8 11.0 11.5 12.2 ?.2.9 13.3 13.6


229 1,686 12.7 .09 11.1 11.4 11.9 12.6 13.4 14.2 14.4


229 1,687 13.8 ;:: .08 11.7 12.0 12.8 13.7 14.7 15.6 16.3


46 422 15.2 1.2 .18 11.8 13.4 14.4 15.2 16.3 16.5 16.5


871 15.0 1.2 .12 12.6 13.1 :f.: 15.1 15.9 16.4 16.7


1:!/ 1,213 15.4 0.9 J: 13.7 14.2 15.4 15.9 16.5 16.9


1,007 15.3 1.1 13.8 13.9 14:4 15.3 15.6 16.8 17.8


1% 1,;:; 15.4 1.6 .09 13.3 13.6 14.3 15.3 16.0 17.6 18.2


14.8 1.3 .12 12.3 13.8 14.0 14.9 15.4 16.0 16.8


2;: 482 14.3 1.6 .10 11.8 12.3 13.2 14.4 15.1 15.9 17.0

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Table 2. Hemoglobin levels of females aged 1-74 years, sample size, estimated population in thousands,meari,


standard deviation,standard error of the mean, and selected percentiles,by race and age: United States,


1971-74


Estimated Percentilei
 Standard


Race and age Sample population Meat Standard error of
 size in deviatior


All races


1 year------------
 2 years


3 years


4-5 years


6-11 years


12-17 years


18=19 yeara


20-24 years


25-34 years


35-44 years


45-54 years


55-64 years


65-74 years


White


1 year------------
 2 yeara


3 years


4-5 years


6-11 years


12-17 years


18-19 years


20-24 years


25-34 years


35-44 years


45-54 years


55-64 years


65-74 yeara


Black


1 year


2 yeara


3 yeara


4-5 years


6-11 years


12-17 years


18-19 years


20-24 years


25-34 years


35-44 years


45-54 years


55-64 years


65-74 years


lg/dl


thousands the mean 5th 10th 25th 50th 75th 90th 95th


254 1,725 12.[ 1.2 .06 9.! 10.5 11.4 12.1 12.6 13.3 13.7 

257 1,742 12.4 .09 10.; 11.0 11.6 12.5 13.1 13.5 14.2 

278 1,694 12.4 i:: .10 10.{ 11.2 11.8 12.4 13.1 13.9 14.0 

571 3,295 12.: 1.0 .07 11.2 11.5 12.0 12.7 13.5 14.0 14.6 

974 11,392 13.2 1.0 .05 11.[ 11.9 12.5 13.1 13.8 14.2 14.8 

1,006 12,187 13.f 1.0 .06 12.C 12.3 12.9 13.6 14.3 14.9 15.4 

260 3,81C 13.6 1.2 .09 11.[ 12.3 13.0 13.6 14.3 15.0 15.3 

1,171 9,047 13.6 1.1 .06 11.$ 12.3 12.9 13.6 14.3 14.9 15.3 

1,793 13,942 13.7 .04 11.$ 12.3 13.0 13.7 14.5 15.2 15.6 

1,584 11,577 13.7 i:: .04 11.; 12.2 13.0 13.7 14.4 15.2 15.7 

788 12,18C 14.C 1.3 .06 12.C 12.5 13.2 14.0 14.7 15.4 15.9 

639 9,998 14.1 1.1 .06 12.5 12.7 13.4 14.1 14.9 15.5 15.8 

1,728 7,13e 14.C 1.2 .05 12.C 12.4 13.2 14.0 14.8 15.5 15.8 

179 1,426 12.C 1.1 .06 & 10.9 11.4 12.1 12.7 13.3 13.6


197 1,459 12.5 1.1 .12 11.0 11.7 12.6 13.2 13.6 14.3


204 1,417 12.5 1.0 .11 10.2 11,2 11.9 12.5 13.2 14.0 14.0


418 2,768 12.8 .08 11.2 11.6 12.1 12.8 13.5 14.0 14.7


734 9,602 13.2 ::: .05 11.6 12.1 12.6 13.2 13.8 14.4 14.8


764 10,391 13.7 1.0 .07 12.1 12.4 13.0 13.7 14.4 15.1 15.5


194 3,263 13.8 .11 12.2 12.6 13.2 13.7 14.3 15.0 15.4


910 7,827 13.7 i:: .06 12.1 12.5 13.0 13.7 14.3 15.0 15.3


1,477 12,193 13.8 1.2 .05 12.1 12.4 13.0 13.8 14.6 15.3 15.7


1,::; 10,100 13.8 .04 11.9 12.3 13.1 13.8 14.4 15.3 15.7


10,878 14.0 ::: .06 12.1 12.6 13.3 14.1 14.8 15.4 16.0


531 9,058 14.2 1.0 .06 12.6 12.9 13.5 14.2 14.9 15.6 15.8


1,426 6,486 14.1 1.2 .05 12.2 12.6 13.3 14.0 14.9 15.6 15.9


267 11,6 1.4 .17 11.1 11.7 12.5 13.0 13.4 

:? 270 11.8 0.8 .13 1::; 1::; 11.3 11.9 12.3 12.6 12.9 

259 11.8 1.0 .18 10.1 10.6 11.3 11,8 12.3 13.1 13.3 

1:; 

234 

503 

1,715 

12.5 

12.6 

1.0 

0.9 

.10 

.07 

11.O 

11.2 

11.1 

11.5 

11.7 

12.0 

12.4 13.1 

12.5 13.2 

13.8 

13.7 

~j.; 

235 1,709 13.0 1.0 .06 11.3 11.7 12.5 13.0 13.8 14.2 14:5 

530 12.6 1.5 .15 11.1 11.9 12’.8 13.4 14.2 14.3 

2% 1,053 13.0 .09 1;:: 11.5 12.1 12.9 14.0 14.6 15.0 

294 1,623 13.1 ::; .08 10.9 11.5 12.3 13.2 14.0 14.6 14.8 

307 1,314 13.2 1.4 .07 10.7 11.3 12.3 13.2 14.1 14.8 15.3 

118 1,256 13.5 1.2 .12 11.4 12.0 12,8 13.6 14.2 14.7 15.0 

105 872 13.3 .15 11.3 11.8 12.5 13.4 14.1 14.5 15.2 

294 629 13.1 i:i .07 10.7 11.3 12.3 13.1 14.0 14.7 15.1 
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ackimedata 7 -

Table 3. Serum iron levels of males aged 1-74 years, sample size, estimated population in thousands,mean,
 standard deviation, standard error of the mean, and selected percentiles,by race and age: United States,


1971-74


Estimated Percentile
 Standard
 population Meanl Standard error of
 in deviation] Che mean]
 thousands 5th 10th 25th 50th 75th 90th 95th


All races


1 year-------- 114


2 years 153


3 years 192


4-5 years 552


6-11 years---- 979


12-17 years--- 1,011


18-19 years--- 246


20-24 years--- 483


25-34 years--- 764


35-44 yeara--- 634


45-54 years--- 715


55-64 years--- 556


65-74 years--- 1,545


White


1 year--------
 2 years 1?!


3 years 142


4-5,years 411


6-11 years---- 719


12-17 years--- 753


18-19 years--- 189


20-24 years--- 394


25-34 years 632


35-44 years 539


45-54 years--- 579


55-64 years--- 464


65-74 years--- 1,232


-k


1 yaar 26


2 years 40


3 years 43


4-5 years 138


6-11 years---- 250


12-17 years--- 250


18-19 years--- 52


20-24 years---


25-34 years--- 1;;


35-44 years---


45-54 years--- 1::


55-64 years


65-74 years 2;’?


l~g/dl


(2) 67.1 34.1 (2) 25.7 29.0 41.0 59.0 88.5 109.8 128.1 

(2) 80.4 34.1 (2) 33.6 39.0 54.0 77.0 95.0 128.8 146.1 

(2) :3.: 34.1 (2) 36.0 45.2 60.0 83.0 110.0 128.8 148.2 

3,427 33.8 1.4 33.0 41.4 63.0 84.0 109.0 131.2 145.3 

11,819 94:1 33.7 42.1 52.0 70.0 92.0 113.0 138.7 153.2 

12,558 113.4 41.1 ::: 56.0 67.0 87.0 108.0 135.0 161.0 180.0 

3,667 119.4 44.6 ;.; 55.1 73.2 93.0 113.0 140.0 177.0 194.6 

8,088 114.4 35.7 . 65.0 72.0 89.0 110.0 136.1 160.0 179.0 

12,991 108.2 36.4 58.0 66.0 84.0 103.0 127.0 152.0 178.0 

10,663 108.1 38.0 ;:: 61.0 65.0 80.0 103.9 129.0 152.2 171.0 

11,195 105.7 38.9 1.8 53.8 64.0 79.9 99.0 126.5 151.0 173.7 

8,971 102.4 34.9 1.6 51.3 61.8 78.8 100.0 121.0 149.8 170.0 

5,470 107.7 34.9 0.9 57.0 66.0 84.0 105.0 126.0 153.8 167.0 

(2) 68.9 32.6 (2) 26.0 29.0 45.0 64,0 88.0 111.4 130.2 

(2) 82.2 31.7 (2) 36.2 45.0 ;:.; 79.5 95.2 124.7 144.0 z & 85.0 34.4 (2) 35.1 44.2 81.0 107.5 123.8 151.0 

87.2 33.6 1.7 33.0 44.7 64:0 85.0 109.0 133.7 145.4 

10;017 94.5 34.4 1.4 42.0 50.6 70.0 93.0 114.0 139.0 154.0 

10,752 115.4 ::.; 1.6 56.0 67.0 88.0 111.0 138.0 162.0 182.0 

3,173 119.5 55.5 73.5 93.0 113.7 140.0 176.5 193.9 

7,077 115.7 36:2 N 65.0 72.1 89.9 113.0 138.0 161.0 179.2 

11,601 108.0 36.9 1.5 57.0 65.0 82.6 103.0 127.0 152.1 177.7 

9,501 108.7 3.8.3 2.1 62.0 67.0 81.8 104.0 129.0 153.0 170.3 

10,096 106.4 39.7 2.0 53.3 64.0 80.0 99.0 127.0 152.8 175.0 

8,169 102.3 35.5 1,8 51.0 61.0 78.6 99,0 12?..0 151.0 171.1 

4,948 108.6 34.7 1.0 57.0 67.0 85.0 106.0 128.0 154.0 166.9 

(2) 61.1 38.8 (2) 23.6 25.6 34.0 45.0 81.5 102.4 119.3 

(2) 74.0 37.9 (2) 25.0 32.0 43.0 62.0 93.0 130.0 144.0 

(2) 94.6 34.4 (2) 46.4 55.0 67.0 80.5 116.0 132.7 144.1 

508 82.3 34.8 2.6 32.0 35.0 61.0 79.0 108.3 123.4 141.9 

1,686 91.6 30.0 2.3 48.0 53.0 67.0 91.0 110.2 134.5 145.8 

1,687 100.8 32.6 47.2 65.0 78.0 97.9 120.0 136.2 153.4 

422 111.3 43.3 ::; 48.0 62.2 86.6 102.0 129.0 161.4 171.0 

871 104.7 31.0 4.6 57.0 71.0 86.8 97.5 120.3 140.8 152.0 

1,213 110.3 32.8 3.3 61.0 74.0 88.4 104.0 134.0 151.5 176.7 

1,007 96.7 32.9 55.0 61.3 72.7 91.6 115.4 139.0 155.9 

1,044 99.1 29.5 H 60.0 63.5 77.0 96.8 114.5 132.3 148.1 

707 101.0 27.3 3.4 59.0 68.9 78.1 101.3 116.0 133.6 143.7 

482 98.0 35.9 1.7 50.8 59.0 75.0 92.0 116.0 144.0 169.9 

‘Estimatedpopulation in thousands and standard error of the mean not included because of Dossible bias


due to missing”v~lues.

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8 dmcecaa 

a 

Table 4. Serum iron levels of females aged 1-74 years, sample size, estimated population in thousands,mean, 

standard deviation, standard error of the mean, and selected percentiles,by race and age: United States, 

1971-74 

Race and age


All races


1 year


2 years


3 years


4-5 years


6-11 years----


12-17 yeara---


18-19 years---


20-24 years---


25-34 years---


35-44 years---


45-54 years---


55-64 years---


65-74 years---


White


1 year


2 yeara


3 years


4-5 yeara


6-11 years----


12-17 years---


18-19 years---


20-24 years---


25-34 years---


35-44 years


45-54 years---


55-64 years---


65-74 years


Black


1 year


2 yeara


3 years


4-5 years


6-11 years----


12-17 years


18-19 years---


20-24 years---


25-34 years---


35-44 years


45-54 years


55-64 years


65-74 years---


lxg/dl


Estimated Standarc Percentile]


Sample population Meanl Standard error o~
 size in deviation the mear
 thousands 5th lotl 25tt 50th 75th 90th 95th


(2) 78.3 33.8 (2) 26.7 36.4 56.C 74.0 94.E 122.3 150.6 

1;; 

175 

(2) 

(2) 

84.2 

85.0 

35.6 

34.1 

(2) 

:2~ 

30.5 

34.E 

35.5 

43.( 

54.2 

59.C 

83.5 

83.5 

113.c 

105.5 

134.0 

124.0 

144.d 

146.0 

571 3,299 89.4 31.7 41.C 52.6 68.C 86.0 108.C 129.8 144.~ 988 11,392 96.1 32.1 1:2 48.[ 58.( 71.C 95.0 117.0 137.0 147.0 

1,011 12,187 100.4 36.2 45.C 55.C 75.C 99.0 122.0 146.3 163.0 

263 3,810 101.3 42.3 ;:: 38.C 50.C 67.C 95.0 129.0 154.0 173.5 

1,188 9,047 106.2 42.0 48.C 55.C 77.C 101.0 130.0 161.4 182.0 

1,822 13,943 102.4 42.9 ::; 44.C 52.C 72.C 95.2 127.0 161.0 180.9 

1,582 11,577 98.0 40.3 42.C 53.C 69.C 94.0 120.0 149.0 171.0 

789 12,180 99.9 36.8 ;:: 47.C 58.1 76.C 94.0 116.8 152.0 172.0 

632 9.998 101.2 34.4 3.C 55.C 61.5 78.C 97.0 118.0 138.0 7.64.8 

1,701 7;138 97.6 31.2 0.6 54.C 60.C 76.C 95.0 116.0 135.0 i52.O 

56 (2) 78.3 33.8 (2) 26.6 36.2 56.0 74.0 94.0 121.4 

104 (2) 88.2 36.4 (2) 29.4 37.0 59.0 85.0 114.0 140.0 

130 z ;:~ 88.7 34.4 J2J 38.0 45.0 63.0 88.0 109.0 124.0 

405 90.4 31.6 43.9 54.0 69.0 87.0 108.0 131.0 

720 9:602 96.8 32.7 1:5 48.0 58.0 72.1 95.0 118.0 138.0 

744 10,391 100.4 36.2 45.0 55.0 75.0 99.0 122.0 147.2 

191 3,263 101.9 42.4 N 39.0 52.3 67.0 95.0 129.9 153.8 ?76.6 

903 7,827 106.9 42.5 1.3 48.0 55.0 77.0 102.0 130.0 165.0 

1,468 12,193 104.0 43.3 44.0 54.0 75.0 96.1 129.0 161.0 

1,221 10,100 98.7 40.3 ::: 43.0 53.6 70.0 94.0 122.0 150.0 

658 10,878 102.0 37.5 2.6 46.0 59.0 78.0 96.0 119.7 157.0 

514 9,058 102.2 34.6 3.2 55.0 62.0 79.0 98.0 118.0 141.0 

1,375 6,486 98.7 31.3 0.7 55.0 62.0 77.0 95.0 117.0 136.6 

(2) 78.5 35.3 (2) 25.0 35.0 45.0 70.0 98.0 123.0 138.0 :: (2) 71.8 31.1 (2) 30.2 33.0 45.8 64.0 97.2 Lll.8 120.0 $2j 74.8 31.8 $24 33.2 35.3 50.8 71.0 91.0 L15.5 140.3 

1:? 84.4 31.8 . 34.6 $3.1 61.4 85.0 105.0 119.1 143.4 

262 1,715 91.8 28.3 53.5 57.0 69.0 87.0 114.0 128.0 137.4 

260 1,709 LOO.6 37.4 ;:; 48.1 54.0 74.0 97.0 127.0 L45.0 156.4 

530 97.8 41.9 5.2 20.6 37.7 65.0 96.6 124.0 L50.O 162.6 

2;: 1,053 103.2 39.6 2.1 40.8 51.0 74.0 96.6 136.0 151.0 168.8 

334 1,623 90.7 37.1 $;.; $7.4 64.0 84.0 110.9 L43.1 162.5 

334 1,314 90.1 37.2 ;:! 15.2 55.0 89.0 108.1 L34.O 138.5 

126 1,256 81.7 23.5 2.3 47:6 56.0 56.0 76.0 92.0 110.6 133.2 

115 872 92.0 31.8 3.4 55.0 57.4 67.0 84.0 112.0 125.0 144.0 

318 629 86.9 28.1 1.1 47.9 54.0 71.0 82.0 105.0 124.0 135.6 

2Estimated populationin thousands and standard error of the mean not included because of possible bias


due to missing values.

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ackme&a9 

Table 5. Percent transferringsaturation of males aged 1-74 years, sample size, estimated population in thou-€

sanda, mean, standard deviation, standard error of the mean, and selected percentiles, by race and age:€

United States, 1971-74€

Estimated Percentile€ Wandard€ Race and age Sample population Mean Standard ?rror of€ size in deviation€

All races€

1 year------------€ 2 years€

3 years€

4-5 yeara---------€ 6-11 yeara€

12-17 years€

18-19 years-------€ 20-24 years-------€ 25-34 years€

35-44 years€

45-54 years€

55-64 years-------€ 65-74 years€

White€

1 year 

2 years 

3 years 

4-5 yeara€

6-11 years€

12-17 years€

18-19 years€

20-24 years€

25-34 years€

35-44 years€

45-54 vears-------€

55-64 $ears€

65-74 years€

Black€

1 year 

2 years 

3 years 

4-5 years 

6-11 years 

12-17 years 

18-19 years 

20-24 years 

25-34 years 

35-44 years 

45-54 years 

55-64 years 

65-74 years 

thousands the mean 5th 10th 25th 5Oth 75th 90th 95th€

113 (1) 16.4 9.3 (1) 5.1 6.0 14.1 21.4 28.3 33.4 

150 (1) 20.6 (1) l::; 18.8 26.2 ::.; 36.8 

192 (1) 23.8 1::; (1) 1::; 1?:; 15.9 22.5 29.7 40.8 

552 3,427 23.3 9.2 0.40 11.3 16.6 22.6 29.0 35:1 38.8 

979 11,819 25.5 0.36 1?:! 13.8 18.9 24.7 31.1 38.2 42.4 

1,011 12>55E 30.1 1::: 0.39 14.2 17.4 22.1 28.6 35.9 44.0 50.5 

246 3,667 32.8 12.7 0.82 15.0 19.5 23.6 30.0 38.5 :;.$ 60.1 

483 8,08e 31.6 10.0 0.44 17.6 20.6 24.2 30.0 37.8 47.0 

764 12,991 30.5 10.4 0.43 16.2 18.2 22.9 29.1 36.4 42:9 51.3 

634 10,663 30.9 11.8 0.63 16.8 18.6 22.4 28.9 ;;.: 43.4 50.1 

715 11,195 30.0 12.3 0.58 15.4 17.4 21.8 27.7 44.1 51.0 

556 8,971 29.8 11.7 0.64 14.8 17.3 22.2 28.3 35:7 43.9 48.0 

1,545 5,47C 32.5 11.6 0.30 16.8 19.6 24.7 31.2 39.1 46.1 51.9 

(1) 16.9 9.2 (1) 5.3 15.7 21.5 27.5 34.2 

1:: 

142 

(1) 

z & 

21.2 

23.1 1::: 

(1) 

o(;L 1::: 

1::: 

11.2 

1::; 

15.3 

19.9 

21.6 

26.6 

28.6 

32.6 

36.3 

36.9 

40.7 

411 23.5 9.2 11.4 16.8 23.0 29.1 35.3 38.5 

719 10;01; 25.6 0:39 lN 13.6 18.8 24.8 31.3 38.5 43.1 

753 10,752 30.6 12:: 0.45 14.4 17.6 22.1 29.1 36.5 44.8 50.5 

189 3,17: 32.7 12.6 0.87 15.1 19.5 23.6 29.5 38.4 49.4 60.2 

394 7,07i 31.9€

632 11,601 30.5€

539 9,501 31.1€

579 10,09{ 30.1€

464 8,16$ 29.7€

1,232 4,94t 32.7€

26 (1; 14.5€

39 18.0€

j~; 25.7€

1;; 22.3€

250 l,68f 25.1€

250 1,68; 27.3€

52 42; 31.1€

871 29.2€

1!: 1,21: 31.0€

1,00: 27.4€ & 1,04~ 28.5€

30.3€

2:: 1:; 30.8€

10.1 0.46 18.2 20.6 24.4 30.2 38.1 44.6 47.1€

10.5 0.46 16.1 18.2 22.8 29.1 36.3 42.9 53.0€

11.9 0.67 16.8 18.7 22.6 29.2 37.0 43.5 49.7€

12.5 0.63 15.4 17.6 21.5 27.7 35.3 ‘$$.; 52.1€

12.0 0.70 14.8 17.3 21.8 28.0 35.6 48.1€

11.6 0.32 16.6 19.6 24.S 31.4 39.2 46:3 52.1€

9.8 (1) 4.5 4.9 19.8 27.9 31.6 

(1) 5.5 1::: 1;:; 23.2 32.2 35.8 

1?:? o (;] 9.8 1::: 16.7 23.3 31.4 38.8 41.2 

8.4 15.1 21.0 28.5 34.9 40.0 

;:2 0:64 13.2 1::; 19.C 24.3 31.0 34.8 39.8 

0.4C 13.8 15.8 21.2 26.7 31.5 38.4 :;.; 1;:: 

9.1 

2.47 

1.1s 

14.8 

16.0 

17.5 

16.7 

22.: 

23.5 

30.1 

29.0 

36.5 

32.5 

40.6 

41.3 42:4 

0.97 17.8 19.9 23.7 30.2 37.5 42.9 43.1 ;:; 1.24 16.1 17.8 19.7 25.2 32.3 37.0 47.2 

9.5 0.95 15.4 16.1 20.4 26.7 35.3 40.6 43.1 

1.01 15.7 18.9 24.7 29.0 37.2 39.3 43.6 

1?:: 0.52 17.2 19.5 23.1 27.9 36.6 45.6 50.3 

lEstimated population in thousands and standard€ error of the mean not included because of possible bias€

due to missing values.€
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10 aciwncedata 

Table 6. Percent transferringsaturationof femalea aged 1-74 years, sample size, estimated populationin


thousands,mean, standard deviation,standard error of themean, and selected percentiles,by race and age:


United States, 1971-74


Estimated Percentile
 Standarc


Race and age Sample population Mean Standard error o~
 size in deviatior the mear
 thousands 5th lotk 25th 50th 75th 90th 95th


All races


1 year (1) 19.5 (1) 6.5 8.3 12.7 18.2 23.8 31.9 36.0 

2 years Iii (1) 22.2 1::: (1) 6.2 14.8 21.1 28.6 35.8 40.8 

3 yeara 175 3 J;i 22.7 (1) 1::: 15.4 22.3 28.1 33.8 39.2 

4-5 yeara 571 24.5 ;:; 0.5: 1?2 13.: 18.2 23.8 30.2 35.3 40.9 

6-11 years 988 11:392 25.8 9.3 0.34 12.5 14.& 18.8 25.1 30.9 38.2 41.6 

12-17 years 1,011 12,187 26.2 0.3: 11.5 14.6 19.2 25.3 32.4 38.6 44.6 

18-19 years 263 3,810 26.8 1;:! 0.6$ 10.4 12.7 18.7 24.4 33.7 43.4 56.2 

20-24 yeara 1,188 9,047 27.3 11.5 0.34 11.5 14.5 ~:.+ 25.9 33.6 43.2 ;4.; 

25-34 years 1,822 13,943 27.1 11.9 0.26 10.2 13.2 25.8 33.4 43.1 

35-44 yeara 1,582 11,577 26.5 11.6 0.3E 10.1 13.2 18:0 25.4 33.2 42.6 48:5 

45-54 years 789 12,180 27.8 11.3 0.7E 11.4 16.2 20.6 25.8 32.7 42.3 50.7 

55-64 years 632 9,998 29.2 10.6 1.07 15.2 17.1 22.5 27.6 34.5 41,0 47.3 

65-74 years 1,701 7,138 28.6 10.0 0.2! 15.0 17.1 22.1 27.5 34.4 40.5 44.6 

White


1 year------------ (1) 19.7 (1) 6.5 8.7 13.1 18.4 23.2 33.6 36.1 

2 years 1:: (1) 23.6 1::: (1) 15.7 23.0 30.8 37.3 42.0 

3 years 130 z ;;; 23.8 9.6 O(;/ 1::; 1;:: 16.9 23.7 28.8 34.9 39.8 

4-5 years 405 24.8 8.9 11.5 13.6 18.7 23.9 30.3 35.5 40.9 

6-11 yeara 720 9;602 26.1 9.5 0:41 12.2 14.9 18.8 25.3 30.9 38.7 42.8 

12-17 years 744 10,391 26.4 0.43 11.5 14.8 19.2 25.4 32.4 39.6 44.9 

18-19 years 199 3,263 27.2 1;:; 0.74 10.5 13.2 18.8 24.6 33.7 43.7 56.3 

20-24 yeara 903 7,827 27.4 11.5 0.39 11.7 14.7 19.1 26.0 33.6 43.4 48.5 

25-34 years 1,468 12,193 27.6 12.0 0.3C 10.4 13.5 19.1 26.3 34.1 43.4 48.7 

35-44 years 1,221 10,100 26.7 11.6 0.43 10.4 13.3 18.2 25.4 33.6 42.9 48.5 

45-54 years 658 10,878 28.4 11.6 0.88 11.3 16.3 20.8 26.7 33.8 43.5 51.6 

55-64 years 514 9,058 29.5 10.7 1.18 15.2 17.8 22.8 27.8 34.5 41.2 48.6 

65-74 years 1,375 6,486 28.8 10.1 0.26 15.0 17.1 22.1 27.7 34.5 40.9 44.9 

Black


1 year 20 18.9 10.4 (1) 4.6 6.8 9.3 17.8 25.2 30.7 31.7


2 years 33 17.8 8.7 (1) 5.8 17.1 23.9 30.1 31.6


3 years 19.7 9.1 o (;; 6.7 ;:: 1;:: 18.2 24.5 30.0 33.7


4-5 years 1:; 23.1 9.0 11.9 16.6 22.6 28.0 32.3 40.5


6-11 years 262 1,715 24.5 8.1 0:65 1;:: 15.0 18.7 23.3 29.9 35.0 38.9


12-17 years 260 1,709 25.6 0.62 12.0 13.3 18.9 24.6 32.7 38.2 39.0


18-19 years 530 24.4 1?:: 1.30 4.7 14.4 23.8 30.6 38.7 42.1


20-24 yeara 2;: 1,053 26.4 10.9 0.59 1;:: 19.0 24.4 33.5 39.8 44.7


25-34 years 334 1,623 23.5 10.3 0.50 1::: 11.9 16.0 22..9 28.7 34.2 43.6


35-44 years 334 1,314 24.8 11.3 0.59 11.6 16.9 23.9 29.8 37.9 42.7


45-54 years 126 1,256 22.7 0.62 1;:: 14.2 17.6 21.0 25.8 31.2 35.9


55-64 years 115 872 26.6 ;:? 1.15 14.8 15.2 18.3 25.4 34.5 38.1 43.4


65-74 years 318 629 26.1 8.1 0.37 13.0 16.1 21.4 25.2 31.3 35.7 38.6


lEstimatedpopulation in thousands and standard error of the mean not included because of .
Dosaible


bias due to missing values.

---

—	 aduancedata 11 

-

REFERENCES 

lNational Center for Health Statistics: Preliminary 

findings of the first Health and Nutrition Examination 

Survey, United States, 1971-1972, dietary intake and 

biochemical findings, by S. Abraham, F. W. Lowenstein, 

and C. L. Johnson. DHEW Pub. No. (HRA) 74-1219-1, 

Health Resources Administration. Washington. U.S. 

Government Printing Office, Jan. 1974. 

2Lowenstein, F. W.: Some preliminary findings from 

the first Health and Nutrition Examination Survey, 

U.S.A., 1971-1972. Proceedings of the Western Hemisphere Nutrition Congress IV, 1974. 

3National Center for Health Statistics: Plan and 

operation of the Health and Nutrition Examination 

Survey, United States, 1971-1973, by H. W. Miller. Vital 

and Health Statktics. Series 1-Nos. 10a and 10b. DHEW 

Pub. No. (HSM) 73-1310. Health Services and Mental 

Health Administration. Washington. U.S. Government 

Printing Office, Feb. 1973. 

TECHNICAL 

The sampling plan for the 65 preselected 

examination locations in the Health and Nutrition Examination Survey followed a highly 

stratified multistage probability design in which 

a sample of the civilian noninstitutionalized 

population of the conterminous United States 

1-74 years of age was selected, Successive elements of the sampling process were the primary 

sampling unit, census enumeration district, segment (a cluster of households), household, 

eIigible person, and finally, sample person. The 

samp Iing design provided for oversampling 

among persons living in poverty areas, preschool 

4National Center for Health Statistics: Biochemical 

fiidings of persons 1-74 years of age in the United 

Stat es: Hemoglobin and iron-related measurements 

1971-1974. Series 11. Public Health Service, Hyattsville, 

M land. To be published. Y National Center for Health Statistics: HANES I, 

hematology and clinical procedures developed or utilized 

by the Bureau of Laboratones, Center for Disease Control, 1971-1975. iVCHS Instruction Manual, Part 16. 

Public Health Service. Hyattsville, Maryland, In preparation. 

6White, J. M., and Flaschka, H. A.: An automated 

procedure, with use of ferrozine, for assay of serum iron 

and total iron-binding capacity. Clin. Chem.: 

19(5):526-528, May 1973-

7Myers, L. D., Habicht, J. P., and Johnson, C. L.: 

Components of the difference between black and white 

women in the U.S.A. of hemoglobin concentrations in 

blood. Am J Epidemiol. In press. 

NOTES 

children, women of childbearing age, and the 

eIderly. 

The biochemical findings for each individual 

have been “weighted” by the reciprocal of the 

probability of selecting the person. An adjustment for persons in the sample \vho were not 

examined and poststratified ratio adjustments 

were also made. Thus the final sampling estimates of the population size were brought into 

closer alignment with the independent U.S. Bureau of the Census estimates for the civilian noninstitutionalized population of the United States 

as of November 1, 1972, by race, sex, and age. 

SYMBOLS 

Data not available—---—-----–----—-–—---

Category not applicable-------------—–—–— . . . 

Quantity zero–—---–--------—-—--—-- -

Quantity more.than O but less than 0.05-— 0.0 

Figure does not meet standards of * reliabilityy or precision--—-------------—– 
,;’.. -’ 

12 ackancedata -.


Recent Issues of A duanw Data b’rom Vila/ and Health Statistics 

No. 45. Use of Family Planning Services by Currently No. 42. Office Vkits to Cardiovascular Specialists, 

Married Women 15-44 Years of Age: United States, National Ambulatory Medical Care Susvey: United 

1973 and 1976 (Issued: States, 1975-76 (Issued: October 31, 1978) 

No. 44. Health Care Coverage: United States, 1976 (In No. 41. Office Visits for Respiratory Conditions, Napreparation) tional Ambulatory Medical Care Sumey: United 

States, 1975-76 (Issued: October 30, 1978) 

No. 43. Use of Intrauterine Contraceptive Devices in 

the United States (Issued: 

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