Table of Contents

Component Description

Polybrominated diphenyl ethers (PBDEs) and 2,2’,4,4’,5,5’-hexabromobiphenyl (PBB-153) are included in a larger group of chemicals known as brominated flame retardants (BFRs) that are added to products such as foam padding, textiles, or plastics to prevent accidental ignition and fire development. BFRs are not chemically bound to the flame-retarded material, so they can enter the environment from volatilization, leaching, or degradation of BFR-containing products. PBDEs are generally persistent in the environment and have been measured in aquatic sediments, house dust, and aquatic and terrestrial animals. PBDEs have been shown to bio accumulate in fish. Humans may be exposed though the diet, including breast feeding, and by contact with BFR-treated products and contaminated house dust.

Eligible Sample

Examined participants aged 12 years and older from a one-third subsample were eligible.

Description of Laboratory Methodology

Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004.

Refer to the Laboratory Methods Files section for a detailed description of the laboratory methods used. 

There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2007-2008 cycle.  However, the samples were measured in a pooled fashion for 2007-2008 rather than individual measurements.

Laboratory Method Files

Polybrominated diphenyl ethers (PBDEs) (July 2013)

Laboratory Quality Assurance and Monitoring

Serum samples were processed, stored and shipped to the Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA for analysis. 

Detailed instructions on specimen collection and processing are discussed in the NHANES Laboratory Procedure Manual (LPM).  Vials are stored under appropriate frozen (-30oC) conditions until they were shipped to the National Center for Environmental Health for testing. 

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 LPM.

Mobile Examination Centers (MECs)

Laboratory team performance is monitored using several techniques. NCHS and contract consultants use a structured competency assessment evaluation during visits to evaluate both the quality of the laboratory work and the quality-control procedures. Each laboratory staff member is observed for equipment operation, specimen collection and preparation; testing procedures and constructive feedback are given to each staff member. Formal retraining sessions are conducted annually to ensure that required skill levels were maintained.

Analytical Laboratories

NHANES uses several methods to monitor the quality of the analyses performed by the contract laboratories. In the MEC, these methods include performing blind split samples collected during “dry run” sessions. In addition, contract laboratories randomly perform repeat testing on 2% of all specimens.

NCHS developed and distributed a quality control protocol for all CDC and contract laboratories, which outlined the use of Westgard rules (Westgard, et al. 1981) when running NHANES specimens. Progress reports containing any problems encountered during shipping or receipt of specimens, summary statistics for each control pool, QC graphs, instrument calibration, reagents, and any special considerations are submitted to NCHS quarterly. The reports are reviewed for trends or shifts in the data. The laboratories are required to explain any identified areas of concern.

All QC procedures recommended by the manufacturers were followed. Reported results for all assays meet the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision, similar to the Westgard rules (Caudill, et al. 2008).

Data Processing and Editing

The data were reviewed. Incomplete data or improbable values were sent to the performing laboratory for confirmation.

Analytic Notes

Refer to the 2007-2008 Laboratory Data Overview for general information on NHANES laboratory data.

Please refer to the NHANES Analytic Guidelines and the on-line NHANES Tutorial for details on the use of sample weights and analytic issues.

Subsample 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. 

Demographic and Other Related Variables

The analysis of NHANES laboratory data must be conducted using the appropriate survey design and demographic variables. The NHANES 2007-2008 Demographics File contains demographic data, health indicators, and other related information collected during household interviews as well as the sample design variables. The recommended procedure for variance estimation requires use of stratum and PSU variables (SDMVSTRA and SDMVPSU, respectively) in the demographic data file.

The Fasting Questionnaire File includes auxiliary information, such as fasting status, length of fast and the time of venipuncture.

This laboratory data file can be linked to the other NHANES data files using the unique survey participant identifier (i.e., SEQN).

Rationale and Methods Used to Create Pooled Results

The 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.  See more details on pool sample formation and exceptions in Table 2. The variable SAMPLEID denotes the identification number for each pool and ranges from 1 through 260. Please refer to the Pooled-Sample Technical Support file (POOLTF_E) for detailed information on individual participants included in each pool.

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.

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. Three variables are provided for each of these analytes. The variable ending in “LC” (ex., LBDBB1LC) indicates whether the result was below the limit of detection: the value “0” means that the result was at or above the limit of detection, “1” indicates that the result was below the limit of detection.  The other variable prefixed “LA” indicates the lipid adjusted detection limits (ex., LBCBB1LA) in (ng/g lipid) due to differences of the lipid levels measured in individual pools/specimens. The third variable (ex., LBCBB1) provides the analytic result for that analyte.  For analytes with analytic results below the lower limit of detection (ex., LBDBB1LC =1), an imputed fill value was placed in the analyte results field. This value is the lower limit of detection divided by the square root of 2 (LLOD/sqrt[2]). The lower limit of detection (LLOD in pg/g serum and ng/g lipid) for BFRs: 

Table 1. NHANES Variable name, common abbreviation and International Union of Pure and Applied Chemistry (IUPAC) name for each analyte reported. Maximum limit of detection (MLOD) expressed as pg/g serum and ng/g lipid.

 

Variable

Common

IUPAC Name

Max LOD

 

Name

Abbrev.

pg/g serum

ng/g lipid

LBCBR1

PBDE17

2,2´,4- Tribromodiphenyl ether

1.8

0.4

LBCBR2

PBDE28

2,4,4´-Tribromodiphenyl ether

1.8

0.4

LBCBR3

PBDE47

2,2´,4,4´-Tetrabromodiphenyl ether

1.8

0.4

LBCBR66

PBDE66

2,3´,4´,4-Tetrabromodiphenyl ether

1.8

0.4

LBCBR4

PBDE85

2,2´,3,4,4´-Tentabromodiphenyl ether

1.8

0.4

LBCBR5

PBDE99

2,2´,4,4´,5-Pentabromodiphenyl ether

1.8

0.4

LBCBR6

PBDE100

2,2´,4,4´,6-Pentabromodiphenyl ether

1.8

0.4

LBCBR7

PBDE153

2,2´,4,4´,5,5´-Hexabromodiphenyl ether

1.8

0.4

LBCBR8

PBDE154

2,2´,4,4´,5,6´-Hexabromodiphenyl ether

1.8

0.4

LBCBR9

PBDE183

2,2´,3,4,4´,5´,6-Heptabromodiphenyl ether

1.8

0.4

LBCBR11

PBDE209

Decabromodiphenyl ether

18

4.1

LBCBB1

PBB153

2,2´,4,4´,5,5´-Hexabromobiphenyl

1.8

0.4

 

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.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. 

Methodological issues for analysis

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

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
Code or Value Value Description Count Cumulative Skip to Item
1 Male 132 132
2 Female 132 264
. Missing 0 264

ETHNICTY - Ethnicity - Recode

Variable Name:
ETHNICTY
SAS Label:
Ethnicity - Recode
English Text:
Ethnicity - Recode
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Non-Hispanic White 118 118
2 Non-Hispanic Black 54 172
3 Mexican American 50 222
4 Other 42 264
. Missing 0 264

RIDAGGRP - Age group

Variable Name:
RIDAGGRP
SAS Label:
Age group
English Text:
Age group
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 12-19 years 42 42
2 20-39 years 72 114
3 40-59 years 71 185
4 60+ years 79 264
. Missing 0 264

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
Code or Value Value Description Count Cumulative Skip to Item
3 to 8 Range of Values 264 264
. Missing 0 264

WTSMSMPA - Adjust sum sampling weights in same pool

Variable Name:
WTSMSMPA
SAS Label:
Adjust sum sampling weights in same pool
English Text:
Adjust sum sampling weights in same pool
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
92401.04944 to 3363512.5108 Range of Values 264 264
. Missing 0 264

LBCBB1 - 2,2',4,4',5,5'-hexabromobiphenyl (pg/g)

Variable Name:
LBCBB1
SAS Label:
2,2',4,4',5,5'-hexabromobiphenyl (pg/g)
English Text:
2,2',4,4',5,5'-hexabromobiphenyl (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 804.4 Range of Values 264 264
. Missing 0 264

LBCBB1LA - 2,2',4,4',5,5'-hxbrmbiphl lipd adj(ng/g)

Variable Name:
LBCBB1LA
SAS Label:
2,2',4,4',5,5'-hxbrmbiphl lipd adj(ng/g)
English Text:
2,2',4,4',5,5'-hxbrmbiphl lipid adj (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.3 to 133 Range of Values 264 264
. Missing 0 264

LBDBB1LC - 2,2',4,4',5,5'-hexabromobiphenyl comnt

Variable Name:
LBDBB1LC
SAS Label:
2,2',4,4',5,5'-hexabromobiphenyl comnt
English Text:
2,2',4,4',5,5'-hexabromobiphenyl comment code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 245 245
1 Below lower detection limit 19 264
. Missing 0 264

LBCBR1 - 2,2',4-tribromodiphenyl ether (pg/g)

Variable Name:
LBCBR1
SAS Label:
2,2',4-tribromodiphenyl ether (pg/g)
English Text:
2,2',4-tribromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 9.8 Range of Values 264 264
. Missing 0 264

LBCBR1LA - 2,2',4-tribromodiphl ether lpd adj(ng/g)

Variable Name:
LBCBR1LA
SAS Label:
2,2',4-tribromodiphl ether lpd adj(ng/g)
English Text:
2,2',4-tribromodiphl ether lipid adj (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 1.5 Range of Values 264 264
. Missing 0 264

LBDBR1LC - 2,2',4-tribromodiphenyl ether comment

Variable Name:
LBDBR1LC
SAS Label:
2,2',4-tribromodiphenyl ether comment
English Text:
2,2',4-tribromodiphenyl ether comment code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 26 26
1 Below lower detection limit 238 264
. Missing 0 264

LBCBR11 - PBDE 209 (pg/g)

Variable Name:
LBCBR11
SAS Label:
PBDE 209 (pg/g)
English Text:
PBDE 209 (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
17.3 to 133.8 Range of Values 264 264
. Missing 0 264

LBCBR11L - PBDE 209 lipid adj (ng/g)

Variable Name:
LBCBR11L
SAS Label:
PBDE 209 lipid adj (ng/g)
English Text:
PBDE 209 lipid adj (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.9 to 21.4 Range of Values 264 264
. Missing 0 264

LBDBR11C - PBDE 209 comment

Variable Name:
LBDBR11C
SAS Label:
PBDE 209 comment
English Text:
PBDE 209 comment
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 28 28
1 Below lower detection limit 236 264
. Missing 0 264

LBCBR2 - 2,4,4'-tribromodiphenyl ether (pg/g)

Variable Name:
LBCBR2
SAS Label:
2,4,4'-tribromodiphenyl ether (pg/g)
English Text:
2,4,4'-tribromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.3 to 54.4 Range of Values 264 264
. Missing 0 264

LBCBR2LA - 2,4,4'-tribrmdphenyl ether lpd adj(ng/g)

Variable Name:
LBCBR2LA
SAS Label:
2,4,4'-tribrmdphenyl ether lpd adj(ng/g)
English Text:
2,4,4'-tribrmdphenyl ether lpd adj (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5 to 7.8 Range of Values 264 264
. Missing 0 264

LBDBR2LC - 2,4,4'-tribromodiphenyl ether comment

Variable Name:
LBDBR2LC
SAS Label:
2,4,4'-tribromodiphenyl ether comment
English Text:
2,4,4'-tribromodiphenyl ether comment
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 264 264
1 Below lower detection limit 0 264
. Missing 0 264

LBCBR3 - 2,2',4,4'-tetrabromodiphenyl ether(pg/g)

Variable Name:
LBCBR3
SAS Label:
2,2',4,4'-tetrabromodiphenyl ether(pg/g)
English Text:
2,2',4,4'-tetrabromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
37.7 to 1036.1 Range of Values 264 264
. Missing 0 264

LBCBR3LA - 2,2',4,4'-tetrmdiphnyl ethr lpd ad(ng/g)

Variable Name:
LBCBR3LA
SAS Label:
2,2',4,4'-tetrmdiphnyl ethr lpd ad(ng/g)
English Text:
2,2',4,4'-tetrmdiphnyl ether lpd adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
5.8 to 169 Range of Values 264 264
. Missing 0 264

LBDBR3LC - 2,2',4,4'-tetrabromphenyl ether comment

Variable Name:
LBDBR3LC
SAS Label:
2,2',4,4'-tetrabromphenyl ether comment
English Text:
2,2',4,4'-tetrabromphenyl ether comment
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 264 264
1 Below lower detection limit 0 264
. Missing 0 264

LBCBR4 - 2,2',3,4,4'-pentbromodiphnyl ether(pg/g)

Variable Name:
LBCBR4
SAS Label:
2,2',3,4,4'-pentbromodiphnyl ether(pg/g)
English Text:
2,2',3,4,4'-pentbromodiphenyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 31.2 Range of Values 264 264
. Missing 0 264

LBCBR4LA - 2,2',3,4,4'-pentabromphnyl lpd adj(ng/g)

Variable Name:
LBCBR4LA
SAS Label:
2,2',3,4,4'-pentabromphnyl lpd adj(ng/g)
English Text:
2,2',3,4,4'-pentabromphnyl lpd adj (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 5.1 Range of Values 264 264
. Missing 0 264

LBDBR4LC - 2,2',3,4,4'-pentabromphenyl ether comt

Variable Name:
LBDBR4LC
SAS Label:
2,2',3,4,4'-pentabromphenyl ether comt
English Text:
2,2',3,4,4'-pentabromphenyl ether comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 206 206
1 Below lower detection limit 58 264
. Missing 0 264

LBCBR5 - 2,2',4,4',5-pentabromodiphnyl ethr(pg/g)

Variable Name:
LBCBR5
SAS Label:
2,2',4,4',5-pentabromodiphnyl ethr(pg/g)
English Text:
2,2',4,4',5-pentabromodiphnyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
6.5 to 324.8 Range of Values 264 264
. Missing 0 264

LBCBR5LA - 2,2',4,4',5-pentabrompheyl lpd adj(ng/g)

Variable Name:
LBCBR5LA
SAS Label:
2,2',4,4',5-pentabrompheyl lpd adj(ng/g)
English Text:
2,2',4,4',5-pentabromphenyl lpid adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 51.9 Range of Values 264 264
. Missing 0 264

LBDBR5LC - 2,2',4,4',5-pentabromphenyl ether comt

Variable Name:
LBDBR5LC
SAS Label:
2,2',4,4',5-pentabromphenyl ether comt
English Text:
2,2',4,4',5-pentabromodiphenyl ether comment code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 264 264
1 Below lower detection limit 0 264
. Missing 0 264

LBCBR6 - 2,2',4,4',6-pentabromodiphyl ether(pg/g)

Variable Name:
LBCBR6
SAS Label:
2,2',4,4',6-pentabromodiphyl ether(pg/g)
English Text:
2,2',4,4',6-pentabromodiphyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
8.2 to 229.5 Range of Values 264 264
. Missing 0 264

LBCBR6LA - 2,2',4,4',6-pentabromdphyl lpd adj(ng/g)

Variable Name:
LBCBR6LA
SAS Label:
2,2',4,4',6-pentabromdphyl lpd adj(ng/g)
English Text:
2,2',4,4',6-pentabromdphyl lipid adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.2 to 36.3 Range of Values 264 264
. Missing 0 264

LBDBR6LC - 2,2',4,4',6-pentabromdphenyl ether comt

Variable Name:
LBDBR6LC
SAS Label:
2,2',4,4',6-pentabromdphenyl ether comt
English Text:
2,2',4,4',6-pentabromdphenyl ether comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 264 264
1 Below lower detection limit 0 264
. Missing 0 264

LBCBR66 - 2,3',4,4'-tetrabromodiphenyl ether(pg/g)

Variable Name:
LBCBR66
SAS Label:
2,3',4,4'-tetrabromodiphenyl ether(pg/g)
English Text:
2,3',4,4'-tetrabromodiphenyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 5.2 Range of Values 264 264
. Missing 0 264

LBCBR66L - 2,3',4,4'-tetrabromodiphyl lpd adj(ng/g)

Variable Name:
LBCBR66L
SAS Label:
2,3',4,4'-tetrabromodiphyl lpd adj(ng/g)
English Text:
2,3',4,4'-tetrabromodiphyl lipid adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 0.8 Range of Values 264 264
. Missing 0 264

LBDBR66C - 2,3',4,4'-tetrabromodiphenyl ether comt

Variable Name:
LBDBR66C
SAS Label:
2,3',4,4'-tetrabromodiphenyl ether comt
English Text:
2,3',4,4'-tetrabromodiphenyl ether comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 6 6
1 Below lower detection limit 258 264
. Missing 0 264

LBCBR7 - 2,2',4,4',5,5'-hxbromodiphnyl ethr(pg/g)

Variable Name:
LBCBR7
SAS Label:
2,2',4,4',5,5'-hxbromodiphnyl ethr(pg/g)
English Text:
2,2',4,4',5,5'-hxbromodiphnyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
16.1 to 448 Range of Values 264 264
. Missing 0 264

LBCBR7LA - 2,2',4,4',5,5'-hxbrompheyl lpd adj(ng/g)

Variable Name:
LBCBR7LA
SAS Label:
2,2',4,4',5,5'-hxbrompheyl lpd adj(ng/g)
English Text:
2,2',4,4',5,5'-hxbromphenyl lipid adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.4 to 71.7 Range of Values 264 264
. Missing 0 264

LBDBR7LC - 2,2',4,4',5,5'-hexabromphenyl ether comt

Variable Name:
LBDBR7LC
SAS Label:
2,2',4,4',5,5'-hexabromphenyl ether comt
English Text:
2,2',4,4',5,5'-hexabromphenyl ether comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 264 264
1 Below lower detection limit 0 264
. Missing 0 264

LBCBR8 - 2,2',4,4',5,6'hexabromodiphyl ethr(pg/g)

Variable Name:
LBCBR8
SAS Label:
2,2',4,4',5,6'hexabromodiphyl ethr(pg/g)
English Text:
2,2',4,4',5,6'-hexabromodiphyl ether(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 29.2 Range of Values 264 264
. Missing 0 264

LBCBR8LA - 2,2',4,4',5,6'-hxabromphyl lpd adj(ng/g)

Variable Name:
LBCBR8LA
SAS Label:
2,2',4,4',5,6'-hxabromphyl lpd adj(ng/g)
English Text:
2,2',4,4',5,6'-hxabromphenyl lpd adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 4.7 Range of Values 264 264
. Missing 0 264

LBDBR8LC - 2,2',4,4',5,6'-hexabromphenyl ether comt

Variable Name:
LBDBR8LC
SAS Label:
2,2',4,4',5,6'-hexabromphenyl ether comt
English Text:
2,2',4,4',5,6'-hexabromphenyl ether comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 192 192
1 Below lower detection limit 72 264
. Missing 0 264

LBCBR9 - 2,2',3,4,4',5,6heptbromdiphyl ethr(pg/g)

Variable Name:
LBCBR9
SAS Label:
2,2',3,4,4',5,6heptbromdiphyl ethr(pg/g)
English Text:
2,2',3,4,4',5',6-heptabromodiphyl ethr(pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.8 to 23.1 Range of Values 264 264
. Missing 0 264

LBCBR9LA - 2,2',3,4,4',5',6-heptbrphl lpd adj(ng/g)

Variable Name:
LBCBR9LA
SAS Label:
2,2',3,4,4',5',6-heptbrphl lpd adj(ng/g)
English Text:
2,2',3,4,4',5',6-heptabrophenl lipid adj(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2 to 3.3 Range of Values 264 264
. Missing 0 264

LBDBR9LC - 2,2',3,4,4',5',6-heptabrophenl ether cmt

Variable Name:
LBDBR9LC
SAS Label:
2,2',3,4,4',5',6-heptabrophenl ether cmt
English Text:
2,2',3,4,4',5',6-heptabrophenl ether cmt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above the detection limit 87 87
1 Below lower detection limit 177 264
. Missing 0 264