Geometric mean and selected percentiles of serum concentrations (in µg/dL) for the total U.S. population aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
10th
50th
90th
Males and Females
Total, 1 year and older
81.2
(79.5-83.0)
45.0
(42.0-46.0)
85.0
(84.0-87.0)
137
(134-139)
7877
1–5 years
65.2
(62.0-68.4)
31.0
(27.0-35.0)
70.0
(64.0-79.0)
115
(110-124)
704
6–11 years
71.5
(68.2-75.0)
39.0
(34.0-41.0)
76.0
(69.0-82.0)
126
(117-131)
887
12–19 years
82.1
(79.7-84.7)
45.0
(42.0-47.0)
87.0
(83.0-89.0)
141
(133-145)
2127
20–39 years
84.5
(81.3-87.8)
45.0
(41.0-48.0)
88.0
(86.0-93.0)
146
(139-154)
1470
40–59 years
83.3
(80.3-86.4)
50.0
(46.0-52.0)
87.0
(83.0-92.0)
135
(131-139)
1199
60 years and older
82.0
(78.5-85.8)
49.0
(44.0-54.0)
83.0
(80.0-86.0)
132
(126-139)
1490
Males
Total, 1 year and older
88.1
(86.1-90.0)
51.0
(49.0-54.0)
92.0
(89.0-94.0)
144
(141-147)
3879
1–5 years
64.9
(61.3-68.7)
33.0
(26.0-38.0)
67.0
(65.0-73.0)
116
(103-125)
388
6–11 years
69.6
(65.9-73.5)
38.0
(31.0-41.0)
75.0
(67.0-81.0)
115
(105-129)
463
12–19 years
92.0
(86.3-98.0)
52.0
(43.0-59.0)
96.0
(91.0-100)
150
(139-161)
1080
20–39 years
93.8
(91.4-96.3)
60.0
(56.0-63.0)
94.0
(92.0-98.0)
154
(141-163)
632
40–59 years
93.7
(89.1-98.6)
56.0
(52.0-63.0)
97.0
(92.0-103)
141
(137-148)
570
60 years and older
86.6
(83.2-90.0)
52.0
(44.0-56.0)
88.0
(85.0-91.0)
145
(137-154)
746
Females
Total, 1 year and older
75.1
(73.3-76.9)
39.0
(37.0-43.0)
79.0
(77.0-81.0)
130
(124-135)
3998
1–5 years
65.5
(58.8-72.9)
30.0
(24.0-37.0)
76.0
(60.0-85.0)
114
(108-128)
316
6–11 years
73.8
(66.9-81.4)
37.0
(27.0-46.0)
76.0
(67.0-87.0)
133
(111-148)
424
12–19 years
72.9
(69.0-77.0)
40.0
(36.0-42.0)
77.0
(71.0-81.0)
128
(116-135)
1047
20–39 years
76.2
(72.0-80.6)
36.0
(33.0-41.0)
82.0
(74.0-87.0)
137
(128-151)
838
40–59 years
74.7
(71.6-77.9)
44.0
(38.0-48.0)
78.0
(71.0-83.0)
125
(115-134)
629
60 years and older
78.5
(73.9-83.5)
49.0
(40.0-54.0)
80.0
(76.0-85.0)
125
(114-133)
744
Table 3.2.b. Serum iron: Mexican Americans
Geometric mean and selected percentiles of serum concentrations (in µg/dL) for Mexican Americans in the U.S. population aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
10th
50th
90th
Males and Females
Total, 1 year and older
80.1
(77.7-82.6)
40.0
(38.0-44.0)
84.0
(81.0-87.0)
139
(136-147)
2710
1–5 years
62.3
(56.6-68.6)
28.0
(21.0-35.0)
70.0
(60.0-79.0)
120
(111-135)
277
6–11 years
71.2
(65.8-77.1)
41.0
(34.0-45.0)
75.0
(68.0-83.0)
117
(110-133)
361
12–19 years
83.3
(79.3-87.4)
44.0
(38.0-48.0)
89.0
(83.0-93.0)
143
(138-148)
938
20–39 years
85.1
(80.1-90.4)
43.0
(37.0-51.0)
88.0
(80.0-97.0)
149
(138-162)
407
40–59 years
85.1
(81.7-88.6)
47.0
(41.0-52.0)
89.0
(83.0-96.0)
147
(131-162)
344
60 years and older
82.1
(76.7-87.7)
48.0
(42.0-52.0)
85.0
(77.0-95.0)
134
(130-139)
383
Males
Total, 1 year and older
90.0
(86.1-94.1)
49.0
(45.0-55.0)
96.0
(90.0-99.0)
153
(143-162)
1348
1–5 years
61.6
(54.7-69.4)
28.0
(21.0-35.0)
65.0
(57.0-75.0)
120
(97.0-148)
152
6–11 years
71.4
(63.3-80.6)
42.0
(32.0-49.0)
74.0
(66.0-84.0)
115
(100-134)
198
12–19 years
94.1
(90.8-97.6)
53.0
(49.0-58.0)
97.0
(92.0-103)
156
(150-162)
481
20–39 years
102
(96.5-109)
62.0
(56.0-69.0)
107
(101-111)
162
(150-176)
170
40–59 years
101
(93.9-108)
62.0
(50.0-76.0)
102
(93.0-112)
151
(133-178)
152
60 years and older
87.3
(81.9-93.0)
44.0
(30.0-60.0)
95.0
(82.0-102)
141
(130-155)
195
Females
Total, 1 year and older
70.8
(67.7-74.1)
36.0
(33.0-38.0)
76.0
(71.0-79.0)
127
(117-132)
1362
1–5 years
63.3
(56.3-71.1)
26.0
(16.0-37.0)
74.0
(58.0-86.0)
117
(105-138)
125
6–11 years
71.1
(64.4-78.4)
38.0
(22.0-51.0)
79.0
(70.0-84.0)
118
(110-129)
163
12–19 years
74.2
(66.6-82.7)
36.0
(30.0-46.0)
79.0
(71.0-87.0)
127
(96.0-144)
457
20–39 years
69.2
(61.3-78.1)
35.0
(30.0-41.0)
75.0
(66.0-84.0)
124
(111-129)
237
40–59 years
72.6
(68.4-77.0)
36.0
(27.0-47.0)
73.0
(66.0-83.0)
130
(116-154)
192
60 years and older
77.4
(70.5-85.1)
48.0
(37.0-57.0)
78.0
(72.0-86.0)
123
(109-137)
188
Table 3.2.c. Serum iron: Non-Hispanic blacks
Geometric mean and selected percentiles of serum concentrations (in µg/dL) for non-Hispanic blacks in the U.S.population aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
10th
50th
90th
Males and Females
Total, 1 year and older
71.7
(69.0-74.6)
38.0
(35.0-39.0)
75.0
(71.0-80.0)
122
(119-130)
1784
1–5 years
67.2
(60.0-75.3)
37.0
(30.0-50.0)
69.0
(62.0-80.0)
109
(96.0-125)
172
6–11 years
71.5
(67.2-76.1)
40.0
(34.0-48.0)
77.0
(73.0-80.0)
117
(103-124)
261
12–19 years
73.5
(68.0-79.4)
39.0
(33.0-42.0)
79.0
(71.0-84.0)
127
(118-138)
584
20–39 years
74.1
(70.0-78.5)
35.0
(31.0-41.0)
81.0
(74.0-83.0)
133
(122-147)
274
40–59 years
71.5
(66.6-76.8)
39.0
(34.0-45.0)
71.0
(66.0-80.0)
126
(112-139)
251
60 years and older
65.4
(61.5-69.5)
33.0
(30.0-40.0)
67.0
(65.0-72.0)
109
(99.0-119)
242
Males
Total, 1 year and older
80.4
(76.3-84.7)
47.0
(39.0-52.0)
82.0
(78.0-85.0)
132
(121-141)
875
1–5 years
68.4
(60.4-77.6)
37.0†
(33.0-40.0)
69.0
(58.0-80.0)
110†
(88.0-149)
93
6–11 years
71.4
(65.7-77.6)
37.0
(28.0-50.0)
79.0
(73.0-84.0)
117
(103-122)
129
12–19 years
82.2
(77.7-86.9)
46.0
(41.0-54.0)
89.0
(82.0-94.0)
132
(121-138)
301
20–39 years
88.4
(82.2-95.0)
57.0
(44.0-67.0)
91.0
(82.0-98.0)
137
(120-153)
117
40–59 years
80.4
(71.8-90.1)
50.0
(31.0-55.0)
80.0
(70.0-94.0)
136
(119-157)
122
60 years and older
73.0
(66.1-80.5)
35.0
(32.0-54.0)
72.0
(64.0-81.0)
119
(101-141)
113
Females
Total, 1 year and older
64.7
(62.1-67.4)
33.0
(30.0-36.0)
67.0
(65.0-70.0)
118
(110-122)
909
1–5 years
65.8
(56.5-76.7)
33.0†
(21.0-54.0)
71.0
(60.0-82.0)
103†
(97.0-123)
79
6–11 years
71.6
(66.3-77.3)
40.0
(27.0-49.0)
76.0
(69.0-80.0)
119
(101-128)
132
12–19 years
65.3
(57.6-74.1)
34.0
(22.0-40.0)
69.0
(60.0-81.0)
123
(108-135)
283
20–39 years
63.9
(59.3-68.9)
30.0
(20.0-33.0)
67.0
(61.0-77.0)
123
(112-159)
157
40–59 years
64.7
(58.2-71.9)
36.0
(31.0-45.0)
67.0
(60.0-71.0)
106
(91.0-115)
129
60 years and older
60.3
(57.3-63.3)
35.0
(29.0-40.0)
65.0
(58.0-68.0)
103
(86.0-116)
129
† Estimate is subject to greater uncertainty due to small cell size.
Table 3.2.d. Serum iron: Non-Hispanic whites
Geometric mean and selected percentiles of serum concentrations (in µg/dL) for non-Hispanic whites in the U.S. population aged 1 year and older, National Health and Nutrition Examination Survey, 1999–2000.
Geometric mean (95% conf. interval)
Selected percentiles (95% conf. interval)
Sample size
10th
50th
90th
Males and Females
Total, 1 year and older
84.0
(81.8-86.2)
47.0
(45.0-51.0)
88.0
(86.0-89.0)
139
(135-141)
2645
1–5 years
68.5
(63.2-74.3)
35.0
(25.0-44.0)
76.0
(66.0-85.0)
117
(109-132)
170
6–11 years
72.6
(67.2-78.5)
37.0
(30.0-41.0)
80.0
(66.0-90.0)
131
(113-146)
191
12–19 years
85.2
(81.2-89.4)
45.0
(40.0-51.0)
89.0
(85.0-91.0)
145
(137-153)
419
20–39 years
87.3
(81.7-93.3)
46.0
(41.0-56.0)
90.0
(85.0-96.0)
148
(139-158)
609
40–59 years
85.9
(82.0-90.0)
51.0
(48.0-54.0)
90.0
(85.0-96.0)
135
(129-140)
496
60 years and older
84.0
(80.4-87.8)
51.0
(47.0-56.0)
86.0
(84.0-90.0)
132
(127-139)
760
Males
Total, 1 year and older
89.9
(86.9-92.9)
53.0
(50.0-56.0)
93.0
(90.0-96.0)
146
(141-151)
1315
1–5 years
67.7
(59.9-76.4)
33.0†
(21.0-45.0)
72.0
(64.0-85.0)
118†
(100-149)
91
6–11 years
70.0
(63.9-76.7)
32.0†
(29.0-41.0)
79.0
(66.0-87.0)
115†
(101-141)
101
12–19 years
94.4
(85.3-104)
52.0
(42.0-64.0)
97.0
(89.0-108)
161
(145-173)
214
20–39 years
94.8
(91.7-98.0)
60.0
(52.0-64.0)
95.0
(92.0-101)
154
(141-169)
265
40–59 years
95.3
(88.6-103)
59.0
(53.0-65.0)
98.0
(92.0-106)
140
(132-147)
254
60 years and older
87.6
(83.9-91.6)
53.0
(47.0-58.0)
88.0
(85.0-92.0)
146
(136-155)
390
Females
Total, 1 year and older
78.5
(76.2-80.9)
43.0
(40.0-46.0)
84.0
(80.0-87.0)
132
(124-141)
1330
1–5 years
69.5
(62.4-77.5)
35.0†
(25.0-40.0)
82.0
(58.0-88.0)
116†
(108-132)
79
6–11 years
75.8
(64.4-89.1)
38.0†
(24.0-50.0)
80.0
(60.0-99.0)
136†
(118-155)
90
12–19 years
75.8
(68.3-84.1)
42.0
(36.0-46.0)
80.0
(69.0-87.0)
127
(115-144)
205
20–39 years
80.4
(72.7-89.0)
41.0
(29.0-47.0)
88.0
(74.0-96.0)
144
(130-161)
344
40–59 years
77.6
(74.6-80.6)
46.0
(39.0-51.0)
80.0
(72.0-85.0)
126
(113-135)
242
60 years and older
81.1
(76.2-86.3)
51.0
(43.0-58.0)
83.0
(79.0-87.0)
125
(113-135)
370
† Estimate is subject to greater uncertainty due to small cell size.
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