We report human serum levels of selected persistent organic
pollutants (POPs) categorized by age, sex, and race/
ethnicity from a statistically representative sampling of the
U.S. population during 2003 and 2004. The serum levels are for
several chemicals listed in the Stockholm Convention on
Persistent Organic Pollutants, in the Geneva Convention on Long-
Range Transboundary Air Pollution, or in both. Population
data for each chemical are described by geometric means
and percentiles and are categorized by age, sex, and race/
ethnicity. At the 90th and 95th percentile, the dioxin total toxic
equivalency (TEQ), using the 2005 toxic equivalency factors
(TEFs) for all persons 12 years of age and older was 30.9 pg/g
lipid (95% confidence interval (CI): 28.2-33.9 pg/g lipid) and
37.8 pg/g lipid (95% CI: 35.3-43.4 pg/g lipid), respectively. At both
the 90th and 95th percentiles total TEQ increased significantly
with increasing age. The population geometric mean (GM)
for the total PCB concentration (sum of 35 congeners) for all
persons 12 years of age and older was 0.820 ng/g whole-weight
(95% CI: 0.782-0.863 ng/g whole-weight) and 134.4 ng/g lipid
(95% CI: 128.9-140.0 ng/g lipid). The population 95th percentile
for the total PCB concentration for all persons 12 years of
age and older was 3.53 ng/g whole-weight (95% CI: 3.23-3.92
ng/g whole-weight) and 531 ng/g lipid (95% CI: 498-570
ng/g lipid). The concentrations of aldrin, endrin, γ-HCH, and o,p′-
DDT were<limit of detection for all strata in the U.S. population.
Hexachlorobenzene was detected in 99.9% of the persons
aged 12 years and older (GM: 15.2 ng/g lipid, 95% CI: 14.5-15.9
ng/g lipid). -HCH was detected in 69.5% of the persons
aged 12 years and older (75th percentile: 14.0 ng/g lipid, 95%
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