Table of Contents

Component Description

Polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (PCBs) [coplanar and several mono-ortho-substituted PCBs] are similar classes of chlorinated aromatic chemicals that are produced as contaminants or byproducts. They have no known commercial or natural use. Dioxins are produced primarily during the incineration or burning of waste; the bleaching processes used in pulp and paper mills; and the chemical syntheses of trichlorophenoxyacetic acid, hexachlorophene, vinyl chloride, trichlorophenol, and pentachlorophenol. Both the synthesis and heat-related degradation of PCBs will produce PCDF by-products. PCBs are chlorinated aromatic hydrocarbon chemicals that were once synthesized for use as heat-exchanger, transformer, and hydraulic fluids, and also used as additives to paints, oils, window caulking, and floor tiles.

Production of PCBs peaked in the early 1970s and was banned in the United States after 1979. Together with the PCDDs and PCDFs, cPCBs and mPCBs are often referred to as “dioxin-like” chemicals because they act in the body through a similar mechanism.

In the environment, these dioxin-like chemicals are persistent and usually occur as a mixture of congeners (i.e., compounds that differ by the numbers and positions of chlorine atoms attached to the dibenzo-p-dioxin, dibenzofuran, or biphenyl structures). The general population is exposed to low levels of these dioxin-like chemicals primarily through ingestion of high-fat foods such as dairy products, eggs, and animal fats, and some fish and wildlife.

Eligible Sample

One-third subset of study participants aged 12 years and older from NHANES 2007 - 2008 with stored serum available to prepare pooled samples. A random one-third subsample of NHANES 2007-2008 participants were used in conjunction with a weighted pooled-sample design to facilitate pooling samples before making analytical measurements.

Description of Laboratory Methodology

The seventeen PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981).

Laboratory Method Files

PBDDs,PCDFs and cPCBs (September 2015)

Laboratory Quality Assurance and Monitoring

The NHANES quality assurance and quality control (QA/QC) protocols meet the 1988 Clinical Laboratory Improvement Act mandates. Detailed QA/QC instructions are discussed in the NHANES Laboratory/Medical Technologists Procedures Manual (LPM). Read the Laboratory Data Overview file for detailed QA/QC protocols.

 

Data Processing and Editing

Read the General Documentation on Laboratory Data file for detailed QA/QC protocols.

The analytical methods are described in the Description of the Laboratory Methodology section.

Detection Limits

In the dataset, the whole weight detection limit (pg/g serum) is a variable and dependent on the available sample size, however, the variation in sample size was low. Lipid adjusted detection limits are variable (ng/g lipid) due to differences of the lipid levels measured in individual pools/specimens. In cases where the result was below the limit of detection, the value for that variable is the detection limit divided by the square root of 2.

Analytic Notes

The National Centers for Disease Control and Prevention (CDC) provides an ongoing assessment of the US population's exposure to environmental chemicals by using biomonitoring in conjunction with CDC's National Health and Nutrition Examination Survey (NHANES). Characterizing the distributions of concentrations of environmental compounds or their metabolites in the US population is a primary objective of CDC's biomonitoring program. Historically, this characterization has been based on individual measurements of these compounds in body fluid or tissue from representative samples of the population. Pooling samples allows for larger sample volumes which can result in lower limits of detection and reduces the number of measurements and costs. In NHANES 2007-2008, a weighted pooled-sample design was implemented to facilitate pooling samples before making analytical measurements. Table 1 lists the IUPAC (International Union of Pure and Applied Chemistry (IUPAC) names, common abbreviation, and NHANES variable name for the analytes included in this data file.

Pools were prepared from serum collected from a random one-third subset of the NHANES 2007-2008 participants aged 12 years and older. Samples were pooled based on gender, race and Hispanic origin, and age. To implement the pooled-sample design, each participant sample was identified as belonging to one of 32 demographic groups based on race and Hispanic origin (non-Hispanic white: NHW, non-Hispanic black: NHB, Mexican American: MA, not non-Hispanic black, non-Hispanic white: or Mexican American: OTHER), gender (Male, Female), and age group (12-19, 20-39, 40-59, and 60+ years of age and older). Eight (8) samples were included in each pool. The number of pools created for each of the 32 demographic groups varied depending on the total number of individual samples available in a demographic group. The one-third subset of NHANES 2007-2008 represents 2282 individual samples, but because the pooled-sample design requires that all samples be of sufficient volume and that there be the same number of samples in each pool, only 2070 samples were available to create 264 pools with 8 samples per pool (Exceptions are in table 2).

In order to incorporate sample weighting into the pooled-sample design it was necessary to use a different volume of material from each sample contributing to a pool. The volume chosen for each sample in a pool was based on the ratio of its sampling weight to the sum of the sampling weights of all samples in the pool. To physically accomplish the pooling in the laboratory required that the ratio of the largest to the smallest sampling weight of samples in the same pool be no larger than about 4 or 5. The individual samples were sorted/stratified by sampling weight within each of the 32 demographic groups and pools were formed using samples with sampling weights adjacent to one another in the sorted list. The number of samples in the one-third subset, number of samples available, the number of these samples that were usable, and the number of pools formed in each demographic group are presented in Table 2. Once the pools were created, summed sampling weights were further adjusted to account for the unused samples. These adjusted summed sampling weights are represented by the variable named WTSMSMPA.

Table 1. NHANES Code, Common Abbreviation and IUPAC Name for each analyte reported
NHANES CODE Common Abbreviation IUPAC Name
TCD 2378D 2,3,7,8-Tetrachlorodibenzo-p-dioxin (TCDD) 
D01 12378D 1,2,3,7,8-Pentachlorodibenzo-p-dioxin (PnCDD)
D02 123478D 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin (HxCDD)
D03 123678D 1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin (HxCDD)
D04 123789D 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin (HxCDD)
D05 1234678D 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin (HpCDD)
D07 OCDD 1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin (OCDD)
F01 2378F 2,3,7,8-Tetrachlorodibenzofuran (TCDF)
F02 12378F 1,2,3,7,8-Pentachlorodibenzofuran (PeCDF)
F03 23478F 2,3,4,7,8-Pentachlorodibenzofuran (PeCDF)
F04 123478F 1,2,3,4,7,8-Hexachlorodibenzofuran (HxCDF)
F05 123678F 1,2,3,6,7,8-Hexachlorodibenzofuran (HxCDF)
F06 123789F 1,2,3,7,8,9-Hexachlorodibenzofuran (HxCDF)
F07 234678F 2,3,4,6,7,8-Hexachlorodibenzofuran (HxCDF)
F08 1234678F 1,2,3,4,6,7,8-Heptachlorodibenzofuran (HpCDF) 
F09 1234789F 1,2,3,4,7,8,9-Heptachlorodibenzofuran (HpCDF)
F10 OCDF 1,2,3,4,6,7,8,9-Octachlorodibenzofuran (OCDF)
TC2 3445P 3,4,4',5-Tetrachlorobiphenyl (PCB 81)
PCB 33445P 3,3',4,4',5-Pentachlorobiphenyl (PCB 126)
HXC 334455P 3,3',4,4',5,5'-Hexachlorobiphenyl (PCB 169)

Table 2. Number of subjects per demographic group in the NHANES 2007–2008 one-third subsample, number of individual serum samples available, number of usable samples, and number of pools formed from usable samples.

Pooled-Sample weights

The original pooled-sample weight created for this file released in July 2013 did not accurately take into account the new sample design for this NHANES survey cycle and it was not correctly stratified to the U.S. population total. This new file contains the corrected sample weight (WTSMSMPA). The corrected sample weight was created so that analyses using race and Hispanic origin would be comparable to the three groups used in NHANES 2005-2006 (non-Hispanic white, non-Hispanic black and Mexican-American). Therefore, analyses of the data for ”Total Hispanics” is not appropriate. No changes or corrections were made to the lab analyte data in this new release. Any analyses of the data using the old public use data file should be repeated using the corrected sample weight on this new file.

PBDEs and PBB-153 were measured in a one third subsample of persons 12 years and over, and samples were pooled in groups of 8 samples per pool within 32 demographic groups. The analysis of NHANES 2007-2008 pooled-sample data must be conducted with the basic demographic variables provided in this data file. This pooled-sample data file cannot be linked to other NHANES 2007-2008 data. Because each sample person does not have an equal probability of selection, sample weighting is needed to produce correct population estimates of means, percentiles, and other descriptive statistics.

The pooled-sample weights required to produce estimates from these data are included in this data file. The analysis of pooled-samples from survey data is a relatively new field of study, and there is currently no established method to produce variance estimates for these pooled results. These data cannot be analyzed using software designed for complex surveys because design features are not available.

Methodological issues for analysis

There are a few pooled-sample methodological publications which address issues related to the following topics (See References.)

• Variance estimation and bias correction when pooling samples from log-normally distributed populations (Caudill, 2010a; Caudill, 2010b; Caudill et al., 2007; Li et al., 2014);
•Models that incorporate measurement error when analyzing pooled-samples from normally or log-normally distributed populations (Caudill, 2010a);
• Incorporation of sample weighting into a pooled-sample design (Caudill, 2012; Caudill, 2010a; Li et al., 2014);
• Estimation of standard errors and confidence limits for point estimates from pooled-samples (Caudill, 2012; Caudill, 2010a; Li et al., 2014; Caudill, 2015).

 

References

Codebook and Frequencies

SAMPLEID - Pool identification number

Variable Name:
SAMPLEID
SAS Label:
Pool identification number
English Text:
Pool identification number
Target:
Both males and females 12 YEARS - 150 YEARS

RIAGENDR - Gender

Variable Name:
RIAGENDR
SAS Label:
Gender
English Text:
Gender
Target:
Both males and females 12 YEARS - 150 YEARS

ETHNICTY - Ethnicity - Recode

Variable Name:
ETHNICTY
SAS Label:
Ethnicity - Recode
English Text:
Ethnicity - Recode
Target:
Both males and females 12 YEARS - 150 YEARS

RIDAGGRP - Age at Screening Adjudicated - Recode

Variable Name:
RIDAGGRP
SAS Label:
Age at Screening Adjudicated - Recode
English Text:
Age at Screening Adjudicated - Recode
Target:
Both males and females 12 YEARS - 150 YEARS

RIANSMP - Number of samples in a pool

Variable Name:
RIANSMP
SAS Label:
Number of samples in a pool
English Text:
Number of samples in a pool
Target:
Both males and females 12 YEARS - 150 YEARS

WTSMSMPA - Adjust sum sampling weights in same pool

Variable Name:
WTSMSMPA
SAS Label:
Adjust sum sampling weights in same pool
English Text:
Adjusted sum sampling weights in same pool
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD01 - 1,2,3,7,8-pncdd (fg/g)

Variable Name:
LBCD01
SAS Label:
1,2,3,7,8-pncdd (fg/g)
English Text:
1,2,3,7,8-Pentachlorodibenzo-p-dioxin (pncdd) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD01LA - 1,2,3,7,8-pncdd lipid adjusted

Variable Name:
LBCD01LA
SAS Label:
1,2,3,7,8-pncdd lipid adjusted
English Text:
1,2,3,7,8-Pentachlorodibenzo-p-dioxin (pncdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD01LC - 1,2,3,7,8-pncdd comment code

Variable Name:
LBDD01LC
SAS Label:
1,2,3,7,8-pncdd comment code
English Text:
1,2,3,7,8-Pentachlorodibenzo-p-dioxin (pncdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD02 - 1,2,3,4,7,8-hxcdd (fg/g)

Variable Name:
LBCD02
SAS Label:
1,2,3,4,7,8-hxcdd (fg/g)
English Text:
1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin (hxcdd)(fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD02LA - 1,2,3,4,7,8-hxcdd lipid adjusted

Variable Name:
LBCD02LA
SAS Label:
1,2,3,4,7,8-hxcdd lipid adjusted
English Text:
1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin (hxcdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD02LC - 1,2,3,4,7,8-hxcdd comment code

Variable Name:
LBDD02LC
SAS Label:
1,2,3,4,7,8-hxcdd comment code
English Text:
1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin (hxcdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD03 - 1,2,3,6,7,8-hxcdd (fg/g)

Variable Name:
LBCD03
SAS Label:
1,2,3,6,7,8-hxcdd (fg/g)
English Text:
1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin (hxcdd)(fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD03LA - 1,2,3,6,7,8-hxcdd lipid adjusted

Variable Name:
LBCD03LA
SAS Label:
1,2,3,6,7,8-hxcdd lipid adjusted
English Text:
1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin (hxcdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD03LC - 1,2,3,6,7,8-hxcdd comment code

Variable Name:
LBDD03LC
SAS Label:
1,2,3,6,7,8-hxcdd comment code
English Text:
1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin (hxcdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD04 - 1,2,3,7,8,9-hxcdd (fg/g)

Variable Name:
LBCD04
SAS Label:
1,2,3,7,8,9-hxcdd (fg/g)
English Text:
1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin (hxcdd) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD04LA - 1,2,3,7,8,9-hxcdd lipid adjusted

Variable Name:
LBCD04LA
SAS Label:
1,2,3,7,8,9-hxcdd lipid adjusted
English Text:
1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin (hxcdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD04LC - 1,2,3,7,8,9-hxcdd comment code

Variable Name:
LBDD04LC
SAS Label:
1,2,3,7,8,9-hxcdd comment code
English Text:
1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin (hxcdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD05 - 1,2,3,4,6,7,8-hpcdd (fg/g)

Variable Name:
LBCD05
SAS Label:
1,2,3,4,6,7,8-hpcdd (fg/g)
English Text:
1,2,3,4,6,7,8-Heptachlororodibenzo-p-dioxin (hpcdd) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD05LA - 1,2,3,4,6,7,8-hpcdd lipid adjusted

Variable Name:
LBCD05LA
SAS Label:
1,2,3,4,6,7,8-hpcdd lipid adjusted
English Text:
1,2,3,4,6,7,8-Heptachlororodibenzo-p-dioxin (hpcdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD05LC - 1,2,3,4,6,7,8-hpcdd comment code

Variable Name:
LBDD05LC
SAS Label:
1,2,3,4,6,7,8-hpcdd comment code
English Text:
1,2,3,4,6,7,8-Heptachlororodibenzo-p-dioxin (hpcdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD07 - 1,2,3,4,6,7,8,9-ocdd (fg/g)

Variable Name:
LBCD07
SAS Label:
1,2,3,4,6,7,8,9-ocdd (fg/g)
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin (ocdd) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCD07LA - 1,2,3,4,6,7,8,9-ocdd Lipid Adjusted

Variable Name:
LBCD07LA
SAS Label:
1,2,3,4,6,7,8,9-ocdd Lipid Adjusted
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin (ocdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDD07LC - 1,2,3,4,6,7,8,9-ocdd comment code

Variable Name:
LBDD07LC
SAS Label:
1,2,3,4,6,7,8,9-ocdd comment code
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin (ocdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF01 - 2,3,7,8,-Tetrachlorofuran (tcdf) (fg/g)

Variable Name:
LBCF01
SAS Label:
2,3,7,8,-Tetrachlorofuran (tcdf) (fg/g)
English Text:
2,3,7,8-Tetrachlorodibenzofuran (tcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF01LA - 2,3,7,8-tcdf lipid adjusted

Variable Name:
LBCF01LA
SAS Label:
2,3,7,8-tcdf lipid adjusted
English Text:
2,3,7,8-Tetrachlorodibenzofuran (tcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF01LC - 2,3,7,8-tcdf comment code

Variable Name:
LBDF01LC
SAS Label:
2,3,7,8-tcdf comment code
English Text:
2,3,7,8-Tetrachlorodibenzofuran (tcdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF02 - 1,2,3,7,8-Pentachlorofuran (pncdf)(fg/g)

Variable Name:
LBCF02
SAS Label:
1,2,3,7,8-Pentachlorofuran (pncdf)(fg/g)
English Text:
1,2,3,7,8-Pentachlorodibenzofuran (pncdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF02LA - 1,2,3,7,8-pncdf lipid adjusted

Variable Name:
LBCF02LA
SAS Label:
1,2,3,7,8-pncdf lipid adjusted
English Text:
1,2,3,7,8-Pentachlorodibenzofuran (pncdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF02LC - 1,2,3,7,8-pncdf comment code

Variable Name:
LBDF02LC
SAS Label:
1,2,3,7,8-pncdf comment code
English Text:
1,2,3,7,8-Pentachlorodibenzofuran (pncdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF03 - 2,3,4,7,8-Pentachlorofuran (pncdf)(fg/g)

Variable Name:
LBCF03
SAS Label:
2,3,4,7,8-Pentachlorofuran (pncdf)(fg/g)
English Text:
2,3,4,7,8-Pentachlorodibenzofuran (pncdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF03LA - 2,3,4,7,8-pncdf lipid adjust

Variable Name:
LBCF03LA
SAS Label:
2,3,4,7,8-pncdf lipid adjust
English Text:
2,3,4,7,8-Pentachlorodibenzofuran (pncdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF03LC - 2,3,4,7,8-pncdf comment code

Variable Name:
LBDF03LC
SAS Label:
2,3,4,7,8-pncdf comment code
English Text:
2,3,4,7,8-Pentachlorodibenzofuran (pncdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF04 - 1,2,3,4,7,8-Hexachlorofuran(hcxdf)(fg/g)

Variable Name:
LBCF04
SAS Label:
1,2,3,4,7,8-Hexachlorofuran(hcxdf)(fg/g)
English Text:
1,2,3,4,7,8-Hexachlorodibenzofuran (hcxdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF04LA - 1,2,3,4,7,8-hcxdf lipid adjusted

Variable Name:
LBCF04LA
SAS Label:
1,2,3,4,7,8-hcxdf lipid adjusted
English Text:
1,2,3,4,7,8-Hexachlorodibenzofuran (hcxdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF04LC - 1,2,3,4,7,8-hcxdf comment code

Variable Name:
LBDF04LC
SAS Label:
1,2,3,4,7,8-hcxdf comment code
English Text:
1,2,3,4,7,8-Hexachlorodibenzofuran (hcxdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF05 - 1,2,3,6,7,8-Hexachlorofuran(hxcdf)(fg/g)

Variable Name:
LBCF05
SAS Label:
1,2,3,6,7,8-Hexachlorofuran(hxcdf)(fg/g)
English Text:
1,2,3,6,7,8-Hexachlorodibenzofuran (hxcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF05LA - 1,2,3,6,7,8-hxcdf lipid adjusted

Variable Name:
LBCF05LA
SAS Label:
1,2,3,6,7,8-hxcdf lipid adjusted
English Text:
1,2,3,6,7,8-Hexachlorodibenzofuran (hxcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF05LC - 1,2,3,6,7,8-hxcdf comment code

Variable Name:
LBDF05LC
SAS Label:
1,2,3,6,7,8-hxcdf comment code
English Text:
1,2,3,6,7,8-Hexachlorodibenzofuran (hxcdf) specimen code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF06 - 1,2,3,7,8,9-Hexachlorodifuran(fg/g)

Variable Name:
LBCF06
SAS Label:
1,2,3,7,8,9-Hexachlorodifuran(fg/g)
English Text:
1,2,3,7,8,9-Hexachlorodibenzofuran (hxcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF06LA - 1,2,3,7,8,9-hxcdf lipid adjusted

Variable Name:
LBCF06LA
SAS Label:
1,2,3,7,8,9-hxcdf lipid adjusted
English Text:
1,2,3,7,8,9-Hexachlorodibenzofuran (hxcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF06LC - 1,2,3,7,8,9-hxcdf comment code

Variable Name:
LBDF06LC
SAS Label:
1,2,3,7,8,9-hxcdf comment code
English Text:
1,2,3,7,8,9-Hexachlorodibenzofuran (hxcdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF07 - 2,3,4,6,7,8-Hexchlorofuran(hxcdf)(fg/g)

Variable Name:
LBCF07
SAS Label:
2,3,4,6,7,8-Hexchlorofuran(hxcdf)(fg/g)
English Text:
2,3,4,6,7,8-Hexchlorodibenzofuran (hxcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF07LA - 2,3,4,6,7,8-hxcdf lipid adjusted

Variable Name:
LBCF07LA
SAS Label:
2,3,4,6,7,8-hxcdf lipid adjusted
English Text:
2,3,4,6,7,8-Hexchlorodibenzofuran (hxcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF07LC - 2,3,4,6,7,8-hxcdf comment code

Variable Name:
LBDF07LC
SAS Label:
2,3,4,6,7,8-hxcdf comment code
English Text:
2,3,4,6,7,8-Hexchlorodibenzofuran (hxcdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF08 - 1,2,3,4,6,7,8-Heptachlorodifuran (fg/g)

Variable Name:
LBCF08
SAS Label:
1,2,3,4,6,7,8-Heptachlorodifuran (fg/g)
English Text:
1,2,3,4,6,7,8-Heptachlorodibenzofuran (hpcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF08LA - 1,2,3,4,6,7,8-hpcdf lipid adjusted

Variable Name:
LBCF08LA
SAS Label:
1,2,3,4,6,7,8-hpcdf lipid adjusted
English Text:
1,2,3,4,6,7,8-Heptachlorodibenzofuran (hpcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF08LC - 1,2,3,4,6,7,8-hpcdf comment code

Variable Name:
LBDF08LC
SAS Label:
1,2,3,4,6,7,8-hpcdf comment code
English Text:
1,2,3,4,6,7,8-Heptachlorodibenzofuran (hpcdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF09 - 1,2,3,4,7,8,9-Heptachlorodifuran (fg/g)

Variable Name:
LBCF09
SAS Label:
1,2,3,4,7,8,9-Heptachlorodifuran (fg/g)
English Text:
1,2,3,4,7,8,9-Heptachlorodibenzofuran (hpcdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF09LA - 1,2,3,4,7,8,9-hpcdf lipid adjusted

Variable Name:
LBCF09LA
SAS Label:
1,2,3,4,7,8,9-hpcdf lipid adjusted
English Text:
1,2,3,4,7,8,9-Heptachlorodibenzofuran (Hpcdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF09LC - 1,2,3,4,7,8,9-hpcdf comment code

Variable Name:
LBDF09LC
SAS Label:
1,2,3,4,7,8,9-hpcdf comment code
English Text:
1,2,3,4,7,8,9-Heptachlorodibenzofuran (hpcdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF10 - 1,2,3,4,6,7,8,9-Octachlorodifuran (fg/g)

Variable Name:
LBCF10
SAS Label:
1,2,3,4,6,7,8,9-Octachlorodifuran (fg/g)
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzofuran (ocdf) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCF10LA - 1,2,3,4,6,7,8,9-ocdf lipid adjusted

Variable Name:
LBCF10LA
SAS Label:
1,2,3,4,6,7,8,9-ocdf lipid adjusted
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzofuran (ocdf) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDF10LC - 1,2,3,4,6,7,8,9-ocdf comment code

Variable Name:
LBDF10LC
SAS Label:
1,2,3,4,6,7,8,9-ocdf comment code
English Text:
1,2,3,4,6,7,8,9-Octachlorodibenzofuran (ocdf) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCHXC - 3,3',4,4',5,5'-hexachlorobiphenyl (fg/g)

Variable Name:
LBCHXC
SAS Label:
3,3',4,4',5,5'-hexachlorobiphenyl (fg/g)
English Text:
3,3',4,4',5,5'-hexachlorobiphenyl (hxcb) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCHXCLA - 3,3',4,4',5,5'-hxcb Lipid Adjusted

Variable Name:
LBCHXCLA
SAS Label:
3,3',4,4',5,5'-hxcb Lipid Adjusted
English Text:
3,3',4,4',5,5'-hexachlorobiphenyl (hxcb) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDHXCLC - 3,3',4,4',5,5'-hxcb comment code

Variable Name:
LBDHXCLC
SAS Label:
3,3',4,4',5,5'-hxcb comment code
English Text:
3,3',4,4',5,5'-hexachlorobiphenyl (hxcb) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCPCB - 3,3',4,4',5-Pentachlorobiphenyl (f/g)

Variable Name:
LBCPCB
SAS Label:
3,3',4,4',5-Pentachlorobiphenyl (f/g)
English Text:
3,3',4,4',5-Pentachlorobiphenyl (pncb) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCPCBLA - 3,3',4,4',5-pncb lipid adjusted

Variable Name:
LBCPCBLA
SAS Label:
3,3',4,4',5-pncb lipid adjusted
English Text:
3,3',4,4',5-Pentachlorobiphenyl (pncb) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDPCBLC - 3,3',4,4',5-pncb comment code

Variable Name:
LBDPCBLC
SAS Label:
3,3',4,4',5-pncb comment code
English Text:
3,3',4,4',5-Pentachlorobiphenyl (pncb) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCTC2 - 3,4,4',5-Tetrachlorobiphenyl (tcb)(fg/g)

Variable Name:
LBCTC2
SAS Label:
3,4,4',5-Tetrachlorobiphenyl (tcb)(fg/g)
English Text:
3,4,4',5-Tetrachlorobiphenyl (tcb) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCTC2LA - 3,4,4',5-tcb lipid adjusted

Variable Name:
LBCTC2LA
SAS Label:
3,4,4',5-tcb lipid adjusted
English Text:
3,4,4',5-Tetrachlorobiphenyl (tcb) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDTC2LC - 3,4,4',5-tcb comment code

Variable Name:
LBDTC2LC
SAS Label:
3,4,4',5-tcb comment code
English Text:
3,4,4',5-Tetrachlorobiphenyl (tcb) comment code
Target:
Both males and females 12 YEARS - 150 YEARS

LBCTCD - 2,3,7,8-Tetrachloro-p-dioxin(tcdd)(fg/g)

Variable Name:
LBCTCD
SAS Label:
2,3,7,8-Tetrachloro-p-dioxin(tcdd)(fg/g)
English Text:
2,3,7,8-Tetrachlorodienzo-p-dioxin (tcdd) (fg/g)
Target:
Both males and females 12 YEARS - 150 YEARS

LBCTCDLA - 2,3,7,8-tcdd lipid adjusted

Variable Name:
LBCTCDLA
SAS Label:
2,3,7,8-tcdd lipid adjusted
English Text:
2,3,7,8-Tetrachlorodienzo-p-dioxin (tcdd) Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS

LBDTCDLC - 2,3,7,8-tcdd comment code

Variable Name:
LBDTCDLC
SAS Label:
2,3,7,8-tcdd comment code
English Text:
2,3,7,8-Tetrachlorodienzo-p-dioxin (tcdd) comment code
Target:
Both males and females 12 YEARS - 150 YEARS