Table 3.5.a. Erythrocyte protoporphyrin: Total population
Geometric mean and selected percentiles of red blood cell 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 and selected percentiles of red blood cell 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 and selected percentiles of red blood cell 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
47.4
(45.8-49.1)
31.0
(30.0-33.0)
44.0
(43.0-47.0)
72.0
(69.0-75.0)
1817
1–5 years
45.4
(43.1-47.8)
31.0
(28.0-33.0)
45.0
(42.0-48.0)
61.0
(57.0-68.0)
180
6–11 years
44.9
(42.7-47.2)
30.0
(29.0-31.0)
44.0
(42.0-46.0)
63.0
(58.0-71.0)
270
12–19 years
45.2
(43.0-47.5)
31.0
(28.0-32.0)
42.0
(40.0-44.0)
67.0
(63.0-75.0)
587
20–39 years
48.0
(44.9-51.3)
32.0
(29.0-34.0)
45.0
(40.0-49.0)
76.0
(67.0-84.0)
277
40–59 years
48.3
(46.0-50.7)
32.0
(31.0-34.0)
46.0
(43.0-48.0)
71.0
(62.0-93.0)
255
60 years and older
51.0
(48.2-54.0)
34.0
(32.0-38.0)
48.0
(45.0-51.0)
78.0
(70.0-86.0)
248
Males
Total, 1 year and older
41.9
(40.1-43.9)
29.0
(28.0-32.0)
41.0
(39.0-43.0)
58.0
(56.0-62.0)
890
1–5 years
45.4
(42.7-48.3)
31.0†
(28.0-36.0)
46.0
(39.0-49.0)
61.0†
(53.0-68.0)
98
6–11 years
43.4
(41.6-45.3)
30.0
(27.0-32.0)
43.0
(40.0-45.0)
60.0
(56.0-70.0)
134
12–19 years
40.5
(39.0-42.1)
29.0
(28.0-31.0)
39.0
(37.0-40.0)
57.0
(51.0-63.0)
301
20–39 years
39.3
(36.2-42.7)
29.0
(26.0-32.0)
38.0
(34.0-40.0)
54.0
(45.0-67.0)
117
40–59 years
42.7
(40.7-44.8)
30.0
(27.0-32.0)
42.0
(38.0-43.0)
57.0
(52.0-63.0)
123
60 years and older
47.5
(43.9-51.4)
32.0
(26.0-36.0)
46.0
(41.0-50.0)
71.0
(62.0-80.0)
117
Females
Total, 1 year and older
53.0
(51.1-54.8)
34.0
(33.0-37.0)
50.0
(48.0-53.0)
82.0
(77.0-88.0)
927
1–5 years
45.4
(42.0-49.0)
31.0†
(28.0-33.0)
43.0
(39.0-49.0)
68.0†
(58.0-79.0)
82
6–11 years
46.5
(42.6-50.8)
30.0
(29.0-33.0)
45.0
(41.0-49.0)
72.0
(62.0-76.0)
136
12–19 years
50.7
(46.2-55.6)
35.0
(32.0-37.0)
46.0
(44.0-50.0)
79.0
(65.0-94.0)
286
20–39 years
56.6
(52.7-60.7)
37.0
(33.0-39.0)
54.0
(51.0-58.0)
82.0
(71.0-104)
160
40–59 years
53.6
(49.4-58.3)
34.0
(31.0-37.0)
53.0
(48.0-56.0)
84.0
(70.0-99.0)
132
60 years and older
53.8
(50.5-57.3)
36.0
(34.0-39.0)
51.0
(46.0-52.0)
82.0
(70.0-105)
131
† Estimate is subject to greater uncertainty due to small cell size.
Geometric mean and selected percentiles of red blood cell 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
46.3
(45.4-47.3)
31.0
(30.0-32.0)
43.0
(43.0-45.0)
68.0
(66.0-70.0)
2674
1–5 years
45.8
(43.0-48.8)
31.0
(30.0-34.0)
44.0
(40.0-47.0)
67.0
(60.0-72.0)
177
6–11 years
43.3
(39.7-47.2)
31.0
(27.0-34.0)
43.0
(40.0-46.0)
61.0
(53.0-73.0)
192
12–19 years
44.2
(42.1-46.3)
32.0
(29.0-33.0)
44.0
(41.0-45.0)
62.0
(58.0-72.0)
423
20–39 years
45.1
(43.5-46.8)
32.0
(30.0-32.0)
44.0
(42.0-44.0)
69.0
(61.0-73.0)
610
40–59 years
46.7
(45.8-47.6)
34.0
(32.0-35.0)
45.0
(43.0-46.0)
66.0
(63.0-71.0)
502
60 years and older
50.3
(49.5-51.0)
34.0
(32.0-34.0)
48.0
(47.0-50.0)
75.0
(72.0-78.0)
770
Males
Total, 1 year and older
42.0
(40.8-43.2)
30.0
(30.0-32.0)
41.0
(40.0-42.0)
58.0
(56.0-60.0)
1330
1–5 years
44.1
(41.3-47.0)
31.0†
(28.0-33.0)
44.0
(40.0-47.0)
64.0†
(55.0-67.0)
95
6–11 years
41.9
(37.8-46.5)
29.0†
(26.0-33.0)
41.0
(39.0-45.0)
61.0†
(49.0-72.0)
103
12–19 years
40.7
(38.1-43.5)
28.0
(26.0-32.0)
41.0
(37.0-43.0)
54.0
(49.0-59.0)
215
20–39 years
39.1
(37.5-40.9)
29.0
(25.0-30.0)
37.0
(35.0-39.0)
53.0
(49.0-59.0)
265
40–59 years
42.7
(41.3-44.2)
32.0
(28.0-34.0)
41.0
(40.0-43.0)
56.0
(52.0-60.0)
258
60 years and older
46.4
(45.3-47.4)
33.0
(32.0-34.0)
43.0
(42.0-45.0)
67.0
(64.0-74.0)
394
Females
Total, 1 year and older
51.0
(49.7-52.3)
35.0
(34.0-37.0)
47.0
(46.0-49.0)
75.0
(73.0-80.0)
1344
1–5 years
47.9
(42.0-54.7)
34.0†
(31.0-36.0)
42.0
(38.0-49.0)
69.0†
(60.0-93.0)
82
6–11 years
45.0
(40.8-49.5)
32.0†
(29.0-35.0)
44.0
(39.0-50.0)
60.0†
(55.0-77.0)
89
12–19 years
48.4
(46.0-50.9)
33.0
(32.0-37.0)
47.0
(45.0-50.0)
73.0
(67.0-77.0)
208
20–39 years
51.9
(49.2-54.8)
36.0
(34.0-39.0)
48.0
(47.0-49.0)
81.0
(72.0-99.0)
345
40–59 years
51.0
(48.8-53.3)
36.0
(34.0-37.0)
49.0
(45.0-52.0)
74.0
(68.0-83.0)
244
60 years and older
53.7
(51.8-55.7)
36.0
(34.0-39.0)
52.0
(49.0-56.0)
79.0
(73.0-84.0)
376
† Estimate is subject to greater uncertainty due to small cell size.
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