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 sample were eligible. 


Description of Laboratory Methodology

Serum samples from NHANES 2011-2012 were stored frozen before analysis. 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 Method Files 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 2011-2012 cycle.

Laboratory Method Files

Brominated Flame Retardants (BFRs) (April 2018)

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 Procedures Manual (LPM). Vials are stored under appropriate frozen (-30oC) conditions until they are 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 Environmental Health 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 2011-2012 Laboratory Data Overview for general information on NHANES laboratory data.

Subsample Weights

BFRs including PBDEs and PBB-153 were measured in a one-third subsample of participants 12 years and older. Special sample weights are required to analyze these data properly. Specific sample weights for this subsample are included in this data file and should be used when analyzing these data.

Samples were pooled in groups of 8 samples per pool within 48 demographic groups. The analysis of NHANES 2011-2012 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 2011-2012 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 design effect adjusted variance estimates for these pooled results. These data cannot be analyzed using software designed for complex surveys because design features are not available. 

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 2011-2012, a weighted pooled-sample design was implemented to facilitate pooling samples before making analytical measurements. Table 1 lists the 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 2011-2012 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 48 demographic groups based on race and Hispanic origin (Mexican American: MA, Other Hispanic: OH, non-Hispanic white: NHW, non-Hispanic black: NHB, non-Hispanic Asian: NHA, Other race including multiracial: 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 48 demographic groups varied depending on the total number of individual samples available in a demographic group. The one-third subset of NHANES 2011-2012 represents 2,144 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, 1,940 samples were available to create 251 pools with 8 samples per pool. For NHANES 2011-2012, due to limited sample size, no pooled sample was formed for females 60 years and older in the “OTHER” race/Hispanic origin group. Data user needs to be cautious when making national inference including this population subgroup. 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 251. Please refer to the Pooled-Sample Technical Support file (POOLTF_G) 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 48 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.

Demographic and Other Related Variables

The analysis of NHANES laboratory data must be conducted using the appropriate survey design and demographic variables. The NHANES 2011-2012 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).

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 name ending “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.  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 second variable prefixed LBC (ex., LBCBB1) provides the analytic result for that analyte. Lipid adjusted detection limits are variable (ng/g lipid) due to differences of the lipid levels measured in individual pools/specimens. The third variable prefixed LBC (ex., LBCBB1LA) provides the lipid adjustment for that pool. 

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/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

1.3

0.33

LBCBR2

PBDE28

2,4,4´-Tribromodiphenyl ether

1.8

0.48

LBCBR3

PBDE47

2,2´,4,4´-Tetrabromodiphenyl ether

2.7

0.70

LBCBR66

PBDE66

2,3´,4´,4-Tetrabromodiphenyl ether

1.6

0.41

LBCBR4

PBDE85

2,2´,3,4,4´-Tentabromodiphenyl ether

0.8

0.19

LBCBR5

PBDE99

2,2´,4,4´,5-Pentabromodiphenyl ether

1.4

0.37

LBCBR6

PBDE100

2,2´,4,4´,6-Pentabromodiphenyl ether

2.8

0.71

LBCBR7

PBDE153

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

0.7

0.18

LBCBR8

PBDE154

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

0.7

0.18

LBCBR9

PBDE183

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

0.8

0.21

LBCBR11

PBDE209

Decabromodiphenyl ether

4.5

1.13

LBCBB1

PBB153

2,2´,4,4´,5,5´-Hexabromobiphenyl

0.7

0.18

 

 

Table 2. Number of subjects in the one-third subsample,number of individual serum samples available, number of usable samples, and number of pools formed from NHANES 2011-2012 participants per demographic group

Race/Ethnicity

Gender

Number of subjects in the one-third subsample/

Number of Samples Available/Number of Usable Samples

(Number of Pools)

12–19 years

(RIDAGEYR=1)1

20–39 years

(RIDAGEYR=2)

40–59 years

(RIDAGEYR=3)

60+ years

(RIDAGEYR=4)

Mexican

American

(RIDRETH3=1) 1

Male

(RIAGENDR=1) 1

39/38/382

(5)

36/34/32

(4)

28/28/283

(4)

17/15/154

(2)

Female

(RIAGENDR=2)

33/28/283

(4)

31/30/305

(4)

21/20/206

(3)

21/19/197

(3)

Other Hispanics

(RIDRETH3=2)

Male

(RIAGENDR=1)

12/11/118

(2)

29/28/283

(4)

22/22/219

(3)

31/27/2710

(4)

Female

(RIAGENDR=2)

24/21/219

(3)

31/28/283

(4)

33/33/32

(4)

33/28/283

(4)

Non-Hispanic White

(RIDRETH3=3)

Male

(RIAGENDR=1)

51/44/4411

(6)

107/97/96

(12)

97/94/9412

(12)

108/98/96

(12)

Female

(RIAGENDR=2)

41/38/382

(5)

111/102/10113

(13)

96/91/88

(11)

120/108/10714

(14)

Non-Hispanic Black

(RIDRETH3=4)

Male

(RIAGENDR=1)

59/57/56

(7)

80/72/72

(9)

74/55/5515

(7)

82/74/72

(9)

Female

(RIAGENDR=2)

57/49/48

(6)

70/66/64

(8)

74/64/64

(8)

78/66/64

(8)

Non-Hispanic Asian

    (RIDRETH3=6)

Male

(RIAGENDR=1)

24/21/206

(3)

56/50/48

(6)

52/48/48

(6)

37/33/32

(4)

Female

(RIAGENDR=2)

34/32/32

(4)

51/48/48

(6)

47/42/4216

(6)

28/24/24

(3)

Other Race  including  Multiracial

(RIDRETH3=7)

Male

(RIAGENDR=1)

11/10/8

(1)

13/11/118

(2)

6/6/617

(1)

4/4/318

(1)

Female

(RIAGENDR=2)

9/6/617

(1)

16/13/1319

(2)

6/5/420

(1)

4/2/021

(0)

1 Value of this categorical variable in the data set; 2 38 Usable samples: four 8 sample and one 6 sample pool were created;

3 28 Usable samples: three 8 sample and one 4 sample pool; 4 15 Usable samples: one 8 sample and one 7 sample pool;

5 30 Usable samples: three 8 sample and two 6 sample pools; 6 20 Usable samples: two 8 sample and one 4 sample pool;

7 19 Usable samples: two 8 sample and one 3 sample pool; 8 11 Usable samples: one 8 sample and one 3 sample pool;

9 21 Usable samples: two 8 sample and one 5 sample pool; 10 27 Usable samples: three 8 sample and one 3 sample pool;

11 44Usable samples: five 8 sample and one 4 sample pool; 12 94 Usable samples: eleven 8 sample and one 6 sample pool;

13 101 Usable samples: twelve 8 sample and one 5 sample pool; 14 107 Usable samples: thirteen 8 sample and one 3 sample pool; 15 55 Usable samples: six 8 sample and one 7 sample pool; 16 42 Usable samples: five 8 sample and one 2 sample pool;

17 6 Usable samples: one 6 sample pool; 18 3 Usable samples: one 3 sample pool; 19 13 Usable samples: one 8 sample and one 5 sample pool; 20 4 Usable samples: one 4 sample pool; 21 0 Usable samples: no pool formed.

   

Methodological approaches for analysis

There are a few pooled-sample methodological publications, which address approaches related to the following topics:


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
Code or Value Value Description Count Cumulative Skip to Item
1 to 251 Range of Values 251 251
. Missing 0 251

RIDRETH3 - Race/Hispanic Origin

Variable Name:
RIDRETH3
SAS Label:
Race/Hispanic Origin
English Text:
Recode of reported race and Hispanic origin information
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Mexican American 29 29
2 Other Hispanic 28 57
3 Non-Hispanic White 85 142
4 Non-Hispanic Black 62 204
6 Non-Hispanic Asian 38 242
7 Other Race, Including Multiracial 9 251
. Missing 0 251

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 47 47
2 20-39 years 74 121
3 40-59 years 66 187
4 60+ years 64 251
. Missing 0 251

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 126 126
2 Female 125 251
. Missing 0 251

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
2 to 8 Range of Values 251 251
. Missing 0 251

WTSMSMPA - Sum of adjusted subsample weights

Variable Name:
WTSMSMPA
SAS Label:
Sum of adjusted subsample weights
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
77222.153098 to 4835522.4391 Range of Values 251 251
. Missing 0 251

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
0.7071 to 218.5 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBB1LA
SAS Label:
2,2',4,4',5,5'-hxbrmbiphl lpd adj (ng/g)
English Text:
2,2',4,4',5,5'-Hexabromobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1131 to 36.35 Range of Values 251 251
. Missing 0 251

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 236 236
1 Below lower detection limit 15 251
. Missing 0 251

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
1.273 to 5.575 Range of Values 249 249
. Missing 2 251

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

Variable Name:
LBCBR1LA
SAS Label:
2,2',4-tribrmobiphl ether lpd adj (ng/g)
English Text:
2,2',4-Tribromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1344 to 0.9885 Range of Values 249 249
. Missing 2 251

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 13 13
1 Below lower detection limit 236 249
. Missing 2 251

LBCBR11 - Decabromodiphenyl ether (pg/g)

Variable Name:
LBCBR11
SAS Label:
Decabromodiphenyl ether (pg/g)
English Text:
Decabromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.455 to 143.5 Range of Values 251 251
. Missing 0 251

LBCBR11L - Decabromodiphenyl ether lipid adj (ng/g)

Variable Name:
LBCBR11L
SAS Label:
Decabromodiphenyl ether lipid adj (ng/g)
English Text:
Decabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7071 to 23.64 Range of Values 251 251
. Missing 0 251

LBDBR11C - Decabromodiphenyl ether comment

Variable Name:
LBDBR11C
SAS Label:
Decabromodiphenyl ether comment
English Text:
Decabromodiphenyl 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 247 247
1 Below lower detection limit 4 251
. Missing 0 251

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
1.838 to 31.82 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR2LA
SAS Label:
2,4,4'-tribrmdphenyl ethr lpd adj (ng/g)
English Text:
2,4,4'-Tribromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.297 to 4.75 Range of Values 251 251
. Missing 0 251

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 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 240 240
1 Below lower detection limit 11 251
. Missing 0 251

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

Variable Name:
LBCBR3
SAS Label:
2,2',4,4'-tetrabromodiphenyl ethr (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
24.41 to 663.3 Range of Values 251 251
. Missing 0 251

LBCBR3LA - 2,2',4,4'-tebrmdphnyl ethr lpd adj(ng/g)

Variable Name:
LBCBR3LA
SAS Label:
2,2',4,4'-tebrmdphnyl ethr lpd adj(ng/g)
English Text:
2,2',4,4'-Tetrabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.114 to 114.5 Range of Values 251 251
. Missing 0 251

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 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 251 251
1 Below lower detection limit 0 251
. Missing 0 251

LBCBR4 - 2,2',3,4,4'-pentbromodiphenyl ethr(pg/g)

Variable Name:
LBCBR4
SAS Label:
2,2',3,4,4'-pentbromodiphenyl ethr(pg/g)
English Text:
2,2',3,4,4'-Pentabromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7071 to 19.12 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR4LA
SAS Label:
2,2',3,4,4'-pntabromphnyl lpd adj (ng/g)
English Text:
2,2',3,4,4'-Pentabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.09899 to 3.39 Range of Values 251 251
. Missing 0 251

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 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 222 222
1 Below lower detection limit 29 251
. Missing 0 251

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
4.958 to 229.6 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR5LA
SAS Label:
2,2',4,4',5-pntabromphenyl lpd adj(ng/g)
English Text:
2,2',4,4',5-Pentabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7411 to 40.71 Range of Values 251 251
. Missing 0 251

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 251 251
1 Below lower detection limit 0 251
. Missing 0 251

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
4.383 to 140.6 Range of Values 251 251
. Missing 0 251

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-Pentabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7387 to 23.98 Range of Values 251 251
. Missing 0 251

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-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 251 251
1 Below lower detection limit 0 251
. Missing 0 251

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
1.556 to 9.096 Range of Values 251 251
. Missing 0 251

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'-Tetrabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1626 to 1.312 Range of Values 251 251
. Missing 0 251

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 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 11 11
1 Below lower detection limit 240 251
. Missing 0 251

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
9.732 to 794 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR7LA
SAS Label:
2,2',4,4',5,5'-hxbrmphenyl lpd adj(ng/g)
English Text:
2,2',4,4',5,5'-Hexabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.64 to 132.1 Range of Values 251 251
. Missing 0 251

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'-Hexabromodiphenyl 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 251 251
1 Below lower detection limit 0 251
. Missing 0 251

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

Variable Name:
LBCBR8
SAS Label:
2,2',4,4',5,6'-hxabromodiphyl ethr(pg/g)
English Text:
2,2',4,4',5,6'-Hexabromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7071 to 19.54 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR8LA
SAS Label:
2,2',4,4',5,6'-hxbrmphenyl lpd adj(ng/g)
English Text:
2,2',4,4',5,6'-Hexabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.09192 to 3.533 Range of Values 251 251
. Missing 0 251

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'-Hexabromodiphenyl 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 226 226
1 Below lower detection limit 25 251
. Missing 0 251

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

Variable Name:
LBCBR9
SAS Label:
2,2',3,4,4',5',6-hptbrodiphyl ethr(pg/g)
English Text:
2,2',3,4,4',5',6-Heptabromodiphenyl ether (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.8485 to 19.43 Range of Values 251 251
. Missing 0 251

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

Variable Name:
LBCBR9LA
SAS Label:
2,2',3,4,4',5',6-hptbrphnl lpd adj(ng/g)
English Text:
2,2',3,4,4',5',6-Heptabromodiphenyl ether Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1131 to 3.67 Range of Values 251 251
. Missing 0 251

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-Heptabromodiphenyl 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 137 137
1 Below lower detection limit 114 251
. Missing 0 251