Table of Contents

Component Description

Polychlorinated biphenyls (PCBs) are a class of chlorinated aromatic hydrocarbon chemicals that once were used as heat-exchanger, transformer, and hydraulic fluids, and as additives to paints, oils, joint caulking, and floor tiles. The different types of PCBs are known as congeners, which are compounds that are distinguished by the number of chlorine atoms and their location on the biphenyl structure. Peak production occurred in the early 1970s, and production was banned in the U.S. after 1979. More than 1.5 million pounds of PCBs were manufactured in the U.S. prior to 1977. Concern about these chemicals continues because of their persistence in the environment and accumulation in wildlife and the animal food chain. PCBs enter the food chain by various routes, including migration into food from external sources, contamination of animal feeds, and accumulation in the fatty tissues of animals. PCBs are found in higher concentrations in fatty foods, (e.g., dairy products and fish), and food is the main source of exposure for the general population. PCBs can be transferred from mother to infant via breast milk. Exposure to these chemicals nearly always occurs as mixtures rather than individual PCB congeners.

Eligible Sample

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

Description of Laboratory Methodology

Serum samples from NHANES 2009-2010 were stored frozen before analysis. Twenty nine non-dioxin-like polychlorinated biphenyls 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 2009-2010 cycle.

Laboratory Method Files

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 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 2009-2010 Laboratory Data Overview for general information on NHANES laboratory data.

Subsample Weights

Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls 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 40 demographic groups. The analysis of NHANES 2009-2010 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 2009-2010 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 2009-2010, 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 2009-2010 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 40 demographic groups based on race and Hispanic origin (Mexican American: MA, Other Hispanic: OH, non-Hispanic white: NHW, non-Hispanic black: NHB, 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 40 demographic groups varied depending on the total number of individual samples available in a demographic group. The one-third subset of NHANES 2009-2010 represents 2524 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, 2322 samples were available to create 301 pools with 8 samples per pool (Exceptions are in Table 2). The variable SAMPLEID denotes the identification number for each pool and ranges from 1 through 303, excluding the numbers 265 and 266. Please refer to the Pooled-Sample Technical Support file (POOLTF_F) 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 40 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. 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.

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 Name Common Abbrev. IUPAC Name Max LOD (pg/g serum) Max LOD (ng/g lipid)
LBC028 PCB28 2,4,4’-Trichlorobiphenyl 3.8 0.92
LBC066 PCB66 2,3’,4,4’-Tetrachlorobiphenyl 3.4 0.69
LBC074 PCB74 2,4,4’,5-Tetrachlorobiphenyl 3.5 0.78
LBC099 PCB99 2,2’,4,4’,5-Pentachlorobiphenyl 1.9 0.44
LBC105 PCB105 2,3,3’,4,4’-Pentachlorobiphenyl 1.9 0.37
LBC114 PCB114 2,3,4,4´,5-Pentachlorobiphenyl 1.9 0.44
LBC118 PCB118 2,3’,4,4’,5-Pentachlorobiphenyl 1.9 0.44
LBC138 PCB138-158 2,2’,3,4,4’,5’- and 2,3,3’,4,4’,6-Hexachlorobiphenyl 1.9 0.44
LBC146 PCB146 2,2’,3,4’,5,5’-Hexachlorobiphenyl 1.9 0.44
LBC153 PCB153 2,2’,4,4’,5,5’-Hexachlorobiphenyl 2.5 0.59
LBC156 PCB156 2,3,3’,4,4’,5-Hexachlorobiphenyl 1.9 0.44
LBC157 PCB157 2,3,3’,4,4’,5’-Hexachlorobiphenyl 1.9 0.44
LBC167 PCB167 2,3’,4,4’,5,5’-Hexachlorobiphenyl 1.8 0.44
LBC170 PCB170 2,2’,3,3’,4,4’,5-Heptachlorobiphenyl 1.9 0.44
LBC178 PCB178 2,2’,3,3’,5,5’,6-Heptachlorobiphenyl 1.9 0.44
LBC180 PCB180 2,2’,3,4,4’,5,5’-Heptachlorobiphenyl 1.9 0.44
LBC183 PCB183 2,2’,3,4,4’,5’,6-Heptachlorobiphenyl 1.8 0.44
LBC187 PCB187 2,2’,3,4’,5,5’,6-Heptachlorobiphenyl 1.9 0.44
LBC189 PCB189 2,3,3’,4,4’,5,5’-Heptachlorobiphenyl 1.9 0.44
LBC194 PCB194 2,2’,3,3’,4,4’,5,5’-Octachlorobiphenyl 1.9 0.44
LBC196 PCB196-203 2,2’,3,3’,4,4’,5’,6- and 2,2’,3,4,4’,5,5’,6-Octachlorobiphenyl 1.8 0.44
LBC199 PCB199 2,2’,3,3’,4,5,6,6’-Octachlorobiphenyl 1.8 0.44
LBC206 PCB206 2,2’,3,3’,4,4’,5,5’,6-Nonachlorobiphenyl 1.9 0.44
LBC209 PCB209 Decachlorobiphenyl 1.9 0.44

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 2009-2010 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

(RIDRETH1=1) 1

Male

(RIAGENDR=1) 1

65/61/602

(8)

67/65/64

(8)

70/65/64

(8)

43/40/40

(5)

Female

(RIAGENDR=2)

57/52/523

(7)

80/76/764

(10)

73/72/72

(9)

51/49/48

(6)

Other Hispanics

(RIDRETH1=2)

Male

(RIAGENDR=1)

22/20/205

(3)

35/34/346

(5)

40/39/397

(5)

26/24/24

(3)

Female

(RIAGENDR=2)

22/20/205

(3)

38/33/32

(4)

39/34/348

(5)

38/35/359

(5)

Non-Hispanic White

(RIDRETH1=3)

Male

(RIAGENDR=1)

91/79/7910

(10)

139/135/13511

(17)

146/142/136

(17)

182/175/168

(21)

Female

(RIAGENDR=2)

76/65/6312

(8)

164/151/15013

(19)

149/138/136

(17)

188/178/176

(22)

 

Non-Hispanic Black

(RIDRETH1=4)

Male

(RIAGENDR=1)

45/43/4314

(6)

56/52/523

(7)

60/54/5415

(7)

72/67/6716

(9)

Female

(RIAGENDR=2)

53/48/48

(6)

63/57/56

(7)

60/53/5317

(7)

58/52/523

(7)

Other Race including Multiracial

(RIDRETH1=5)

Male

(RIAGENDR=1)

13/11/1118

(2)

21/19/1819

(3)

18/18/16

(2)

16/15/1520

(2)

Female

(RIAGENDR=2)

18/17/16

(2)

31/30/3021

(4)

23/21/2122

(3)

16/15/1323

(2)

1 Value of this categorical variable in the data set
2 60 Usable samples: seven 8 sample and one 4 sample pool were created
3 52 Usable samples: six 8 sample and one 4 sample pool
4 76 Usable samples: nine 8 sample and one 4 sample pool
5 20 Usable samples: two 8 sample and one 4 sample pool
6 34 Usable samples: three 8 sample and two 5 sample pools
7 39 Usable samples: four 8 sample and one 7 sample pool
8 34 Usable samples: four 8 sample and one 2 sample pool
9 35 Usable samples: four 8 sample and one 3 sample pool
10 79 Usable samples: nine 8 sample and one 7 sample pool
11 135 Usable samples: sixteen 8 sample and one 7 sample pool
12 63 Usable samples: seven 8 sample and one 7 sample pool
13 150 Usable samples: eighteen 8 sample and one 6 sample pool
14 34 Usable samples: five 8 sample and one 3 sample pool
15 54 Usable samples: six 8 sample and one 6 sample pool
16 67 Usable samples: eight 8 sample and one 3 sample pool
17 53 Usable samples: six 8 sample and one 5 sample pool
18 11 Usable samples: one 6 sample and one 5 sample pool
19 18 Usable samples: one 8 sample, one 6 sample, and one 4 sample pool
20 15 Usable samples: one 8 sample and one 7 sample pool
21 30 Usable samples: three 8 sample and one 6 sample pool
22 21 Usable samples: two 8 sample and one 5 sample pool
23 13 usable samples: one 8 sample and one 5 sample pool.

Methodological approaches for analysis

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

• 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);
• Estimation of standard errors and confidence limits for point estimates from pooled-samples (Caudill, 2012; Caudill, 2010a).


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

RIDRETH1 - Race\Hispanic origin

Variable Name:
RIDRETH1
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 61 61
2 Other Hispanic 33 94
3 Non-Hispanic White 131 225
4 Non-Hispanic Black 56 281
5 Other Race, Including Multiracial 20 301
. Missing 0 301

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 55 55
2 20-39 84 139
3 40-59 80 219
4 60+ 82 301
. Missing 0 301

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 148 148
2 Female 153 301
. Missing 0 301

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 301 301
. Missing 0 301

WTSMSMPA - Sum of adjusted subsample weights

Variable Name:
WTSMSMPA
SAS Label:
Sum of adjusted subsample weights
English Text:
Sum of adjusted subsample weights in same pool
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
49070.542891 to 2980185.9468 Range of Values 301 301
. Missing 0 301

LBC028 - PCB 28 (ng/g)

Variable Name:
LBC028
SAS Label:
PCB 28 (ng/g)
English Text:
2,4,4’-Trichlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.414 to 43.65 Range of Values 299 299
. Missing 2 301

LBC028LA - PCB 28 Lipid Adj (ng/g)

Variable Name:
LBC028LA
SAS Label:
PCB 28 Lipid Adj (ng/g)
English Text:
2,4,4’-Trichlorobiphenyl Lipid Adjusted
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2121 to 7.525 Range of Values 299 299
. Missing 2 301

LBD028LC - PCB 28 Comment Code

Variable Name:
LBD028LC
SAS Label:
PCB 28 Comment Code
English Text:
2,4,4’-Trichlorobiphenyl 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 274 274
1 Below lower detection limit 25 299
. Missing 2 301

LBC066 - PCB 66 (ng/g)

Variable Name:
LBC066
SAS Label:
PCB 66 (ng/g)
English Text:
2,3’,4,4’-Tetrachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.273 to 29.3 Range of Values 300 300
. Missing 1 301

LBC066LA - PCB 66 Lipid Adj (ng/g)

Variable Name:
LBC066LA
SAS Label:
PCB 66 Lipid Adj (ng/g)
English Text:
2,3’,4,4’-Tetrachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1768 to 5.524 Range of Values 300 300
. Missing 1 301

LBD066LC - PCB 66 Comment Code

Variable Name:
LBD066LC
SAS Label:
PCB 66 Comment Code
English Text:
2,3’,4,4’-Tetrachlorobiphenyl 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 237 237
1 Below lower detection limit 63 300
. Missing 1 301

LBC074 - PCB 74 (ng/g)

Variable Name:
LBC074
SAS Label:
PCB 74 (ng/g)
English Text:
2,4,4’,5-Tetrachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.462 to 174.2 Range of Values 300 300
. Missing 1 301

LBC074LA - PCB 74 Lipid Adj (ng/g)

Variable Name:
LBC074LA
SAS Label:
PCB 74 Lipid Adj (ng/g)
English Text:
2,4,4’,5-Tetrachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5232 to 32.32 Range of Values 300 300
. Missing 1 301

LBD074LC - PCB 74 Comment Code

Variable Name:
LBD074LC
SAS Label:
PCB 74 Comment Code
English Text:
2,4,4’,5-Tetrachlorobiphenyl 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 299 299
1 Below lower detection limit 1 300
. Missing 1 301

LBC099 - PCB 99 (ng/g)

Variable Name:
LBC099
SAS Label:
PCB 99 (ng/g)
English Text:
2,2’,4,4’,5-Pentachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2.022 to 176.8 Range of Values 296 296
. Missing 5 301

LBC099LA - PCB 99 Lipid Adj (ng/g)

Variable Name:
LBC099LA
SAS Label:
PCB 99 Lipid Adj (ng/g)
English Text:
2,2’,4,4’,5-Pentachlorobiphenyl Lipid Adjusted(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.4296 to 29.48 Range of Values 296 296
. Missing 5 301

LBD099LC - PCB 99 Comment Code

Variable Name:
LBD099LC
SAS Label:
PCB 99 Comment Code
English Text:
2,2’,4,4’,5-Pentachlorobiphenyl 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 296 296
1 Below lower detection limit 0 296
. Missing 5 301

LBC105 - PCB 105 (ng/g)

Variable Name:
LBC105
SAS Label:
PCB 105 (ng/g)
English Text:
2,3,3’,4,4’-Pentachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7 to 61.74 Range of Values 291 291
. Missing 10 301

LBC105LA - PCB 105 Lipid Adj (ng/g)

Variable Name:
LBC105LA
SAS Label:
PCB 105 Lipid Adj (ng/g)
English Text:
2,3,3’,4,4’-Pentachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1273 to 10.53 Range of Values 291 291
. Missing 10 301

LBD105LC - PCB 105 Comment Code

Variable Name:
LBD105LC
SAS Label:
PCB 105 Comment Code
English Text:
2,3,3’,4,4’-Pentachlorobiphenyl 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 284 284
1 Below lower detection limit 7 291
. Missing 10 301

LBC114 - PCB 114 (ng/g)

Variable Name:
LBC114
SAS Label:
PCB 114 (ng/g)
English Text:
2,3,4,4',5-Pentachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 24.28 Range of Values 299 299
. Missing 2 301

LBC114LA - PCB 114 Lipid Adj (ng/g)

Variable Name:
LBC114LA
SAS Label:
PCB 114 Lipid Adj (ng/g)
English Text:
2,3,4,4',5-Pentachlorobiphenyl 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 3.733 Range of Values 299 299
. Missing 2 301

LBD114LC - PCB 114 Comment Code

Variable Name:
LBD114LC
SAS Label:
PCB 114 Comment Code
English Text:
2,3,4,4',5-Pentachlorobiphenyl 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 200 200
1 Below lower detection limit 99 299
. Missing 2 301

LBC118 - PCB 118 (ng/g)

Variable Name:
LBC118
SAS Label:
PCB 118 (ng/g)
English Text:
2,3’,4,4’,5-Pentachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.786 to 327.7 Range of Values 298 298
. Missing 3 301

LBC118LA - PCB 118 Lipid Adj (ng/g)

Variable Name:
LBC118LA
SAS Label:
PCB 118 Lipid Adj (ng/g)
English Text:
2,3’,4,4’,5-Pentachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.037 to 54.64 Range of Values 298 298
. Missing 3 301

LBD118LC - PCB 118 Comment Code

Variable Name:
LBD118LC
SAS Label:
PCB 118 Comment Code
English Text:
2,3’,4,4’,5-Pentachlorobiphenyl 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 298 298
1 Below lower detection limit 0 298
. Missing 3 301

LBC138 - PCB 138 (ng/g)

Variable Name:
LBC138
SAS Label:
PCB 138 (ng/g)
English Text:
2,2’,3,4,4’,5’- and 2,3,3’,4,4’,6-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
7.821 to 681.9 Range of Values 298 298
. Missing 3 301

LBC138LA - PCB 138 Lipid Adj (ng/g)

Variable Name:
LBC138LA
SAS Label:
PCB 138 Lipid Adj (ng/g)
English Text:
2,2’,3,4,4’,5’- and 2,3,3’,4,4’,6-Hexachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.662 to 117.3 Range of Values 298 298
. Missing 3 301

LBD138LC - PCB 138 Comment Code

Variable Name:
LBD138LC
SAS Label:
PCB 138 Comment Code
English Text:
2,2’,3,4,4’,5’- and 2,3,3’,4,4’,6-Hexachlorobiphenyl 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 298 298
1 Below lower detection limit 0 298
. Missing 3 301

LBC146 - PCB 146 (ng/g)

Variable Name:
LBC146
SAS Label:
PCB 146 (ng/g)
English Text:
2,2’,3,4’,5,5’-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7 to 170.9 Range of Values 288 288
. Missing 13 301

LBC146LA - PCB 146 Lipid Adj (ng/g)

Variable Name:
LBC146LA
SAS Label:
PCB 146 Lipid Adj (ng/g)
English Text:
2,2’,3,4’,5,5’-Hexachlorobiphenyl Lipid Adjusted(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1273 to 29.39 Range of Values 288 288
. Missing 13 301

LBD146LC - PCB 146 Comment Code

Variable Name:
LBD146LC
SAS Label:
PCB 146 Comment Code
English Text:
2,2’,3,4’,5,5’-Hexachlorobiphenyl 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 281 281
1 Below lower detection limit 7 288
. Missing 13 301

LBC153 - PCB 153 (ng/g)

Variable Name:
LBC153
SAS Label:
PCB 153 (ng/g)
English Text:
2,2’,4,4’,5,5’-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
9.088 to 1231 Range of Values 299 299
. Missing 2 301

LBC153LA - PCB 153 Lipid Adj (ng/g)

Variable Name:
LBC153LA
SAS Label:
PCB 153 Lipid Adj (ng/g)
English Text:
2,2’,4,4’,5,5’-Hexachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.885 to 211.7 Range of Values 299 299
. Missing 2 301

LBD153LC - PCB 153 Comment Code

Variable Name:
LBD153LC
SAS Label:
PCB 153 Comment Code
English Text:
2,2’,4,4’,5,5’-Hexachlorobiphenyl 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 299 299
1 Below lower detection limit 0 299
. Missing 2 301

LBC156 - PCB 156 (ng/g)

Variable Name:
LBC156
SAS Label:
PCB 156 (ng/g)
English Text:
2,3,3’,4,4’,5-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7 to 117.2 Range of Values 300 300
. Missing 1 301

LBC156LA - PCB 156 Lipid Adj (ng/g)

Variable Name:
LBC156LA
SAS Label:
PCB 156 Lipid Adj (ng/g)
English Text:
2,3,3’,4,4’,5-Hexachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1485 to 19.84 Range of Values 300 300
. Missing 1 301

LBD156LC - PCB 156 Comment Code

Variable Name:
LBD156LC
SAS Label:
PCB 156 Comment Code
English Text:
2,3,3’,4,4’,5-Hexachlorobiphenyl 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 293 293
1 Below lower detection limit 7 300
. Missing 1 301

LBC157 - PCB 157 (ng/g)

Variable Name:
LBC157
SAS Label:
PCB 157 (ng/g)
English Text:
2,3,3’,4,4’,5’-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 26.47 Range of Values 300 300
. Missing 1 301

LBC157LA - PCB 157 Lipid Adj (ng/g)

Variable Name:
LBC157LA
SAS Label:
PCB 157 Lipid Adj (ng/g)
English Text:
2,3,3’,4,4’,5’-Hexachlorobiphenyl 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 4.587 Range of Values 300 300
. Missing 1 301

LBD157LC - PCB 157 Comment Code

Variable Name:
LBD157LC
SAS Label:
PCB 157 Comment Code
English Text:
2,3,3’,4,4’,5’-Hexachlorobiphenyl 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 74 300
. Missing 1 301

LBC167 - PCB 167 (ng/g)

Variable Name:
LBC167
SAS Label:
PCB 167 (ng/g)
English Text:
2,3’,4,4’,5,5’-Hexachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 47.33 Range of Values 292 292
. Missing 9 301

LBC167LA - PCB 167 Lipid Adj (ng/g)

Variable Name:
LBC167LA
SAS Label:
PCB 167 Lipid Adj (ng/g)
English Text:
2,3’,4,4’,5,5’-Hexachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1061 to 8.141 Range of Values 292 292
. Missing 9 301

LBD167LC - PCB 167 Comment Code

Variable Name:
LBD167LC
SAS Label:
PCB 167 Comment Code
English Text:
2,3’,4,4’,5,5’-Hexachlorobiphenyl 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 238 238
1 Below lower detection limit 54 292
. Missing 9 301

LBC170 - PCB 170 (ng/g)

Variable Name:
LBC170
SAS Label:
PCB 170 (ng/g)
English Text:
2,2’,3,3’,4,4’,5-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.346 to 265.8 Range of Values 296 296
. Missing 5 301

LBC170LA - PCB 170 Lipid Adj (ng/g)

Variable Name:
LBC170LA
SAS Label:
PCB 170 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,4,4’,5-Heptachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.2905 to 45.72 Range of Values 296 296
. Missing 5 301

LBD170LC - PCB 170 Comment Code

Variable Name:
LBD170LC
SAS Label:
PCB 170 Comment Code
English Text:
2,2’,3,3’,4,4’,5-Heptachlorobiphenyl 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 296 296
1 Below lower detection limit 0 296
. Missing 5 301

LBC178 - PCB 178 (ng/g)

Variable Name:
LBC178
SAS Label:
PCB 178 (ng/g)
English Text:
2,2’,3,3’,5,5’,6-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 68.31 Range of Values 280 280
. Missing 21 301

LBC178LA - PCB 178 Lipid Adj (ng/g)

Variable Name:
LBC178LA
SAS Label:
PCB 178 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,5,5’,6-Heptachlorobiphenyl Lipid Adjusted(ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1202 to 11.75 Range of Values 280 280
. Missing 21 301

LBD178LC - PCB 178 Comment Code

Variable Name:
LBD178LC
SAS Label:
PCB 178 Comment Code
English Text:
2,2’,3,3’,5,5’,6-Heptachlorobiphenyl 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 237 237
1 Below lower detection limit 43 280
. Missing 21 301

LBC180 - PCB 180 (ng/g)

Variable Name:
LBC180
SAS Label:
PCB 180 (ng/g)
English Text:
2,2’,3,4,4’,5,5’-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.217 to 776.5 Range of Values 301 301
. Missing 0 301

LBC180LA - PCB 180 Lipid Adj (ng/g)

Variable Name:
LBC180LA
SAS Label:
PCB 180 Lipid Adj (ng/g)
English Text:
2,2’,3,4,4’,5,5’-Heptachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.889 to 133.6 Range of Values 301 301
. Missing 0 301

LBD180LC - PCB 180 Comment Code

Variable Name:
LBD180LC
SAS Label:
PCB 180 Comment Code
English Text:
2,2’,3,4,4’,5,5’-Heptachlorobiphenyl 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 301 301
1 Below lower detection limit 0 301
. Missing 0 301

LBC183 - PCB 183 (ng/g)

Variable Name:
LBC183
SAS Label:
PCB 183 (ng/g)
English Text:
2,2’,3,4,4’,5’,6-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 108.2 Range of Values 286 286
. Missing 15 301

LBC183LA - PCB 183 Lipid Adj (ng/g)

Variable Name:
LBC183LA
SAS Label:
PCB 183 Lipid Adj (ng/g)
English Text:
2,2’,3,4,4’,5’,6-Heptachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1061 to 18.61 Range of Values 286 286
. Missing 15 301

LBD183LC - PCB 183 Comment Code

Variable Name:
LBD183LC
SAS Label:
PCB 183 Comment Code
English Text:
2,2’,3,4,4’,5’,6-Heptachlorobiphenyl 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 272 272
1 Below lower detection limit 14 286
. Missing 15 301

LBC187 - PCB 187 (ng/g)

Variable Name:
LBC187
SAS Label:
PCB 187 (ng/g)
English Text:
2,2’,3,4’,5,5’,6-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7 to 370.2 Range of Values 286 286
. Missing 15 301

LBC187LA - PCB 187 Lipid Adj (ng/g)

Variable Name:
LBC187LA
SAS Label:
PCB 187 Lipid Adj (ng/g)
English Text:
2,2’,3,4’,5,5’,6-Heptachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1485 to 63.68 Range of Values 286 286
. Missing 15 301

LBD187LC - PCB 187 Comment Code

Variable Name:
LBD187LC
SAS Label:
PCB 187 Comment Code
English Text:
2,2’,3,4’,5,5’,6-Heptachlorobiphenyl 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 283 283
1 Below lower detection limit 3 286
. Missing 15 301

LBC189 - PCB 189 (ng/g)

Variable Name:
LBC189
SAS Label:
PCB 189 (ng/g)
English Text:
2,3,3’,4,4’,5,5’-Heptachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 11.29 Range of Values 299 299
. Missing 2 301

LBC189LA - PCB 189 Lipid Adj (ng/g)

Variable Name:
LBC189LA
SAS Label:
PCB 189 Lipid Adj (ng/g)
English Text:
2,3,3’,4,4’,5,5’-Heptachlorobiphenyl 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 1.942 Range of Values 299 299
. Missing 2 301

LBD189LC - PCB 189 Comment Code

Variable Name:
LBD189LC
SAS Label:
PCB 189 Comment Code
English Text:
2,3,3’,4,4’,5,5’-Heptachlorobiphenyl 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 167 167
1 Below lower detection limit 132 299
. Missing 2 301

LBC194 - PCB 194 (ng/g)

Variable Name:
LBC194
SAS Label:
PCB 194 (ng/g)
English Text:
2,2’,3,3’,4,4’,5,5’-Octachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 174.1 Range of Values 293 293
. Missing 8 301

LBC194LA - PCB 194 Lipid Adj (ng/g)

Variable Name:
LBC194LA
SAS Label:
PCB 194 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,4,4’,5,5’-Octachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1414 to 31.13 Range of Values 293 293
. Missing 8 301

LBD194LC - PCB 194 Comment Code

Variable Name:
LBD194LC
SAS Label:
PCB 194 Comment Code
English Text:
2,2’,3,3’,4,4’,5,5’-Octachlorobiphenyl 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 284 284
1 Below lower detection limit 9 293
. Missing 8 301

LBC196 - PCB 196 (ng/g)

Variable Name:
LBC196
SAS Label:
PCB 196 (ng/g)
English Text:
2,2’,3,3’,4,4’,5’,6- and 2,2’,3,4,4’,5,5’,6-Octachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7 to 190.5 Range of Values 292 292
. Missing 9 301

LBC196LA - PCB 196 Lipid Adj (ng/g)

Variable Name:
LBC196LA
SAS Label:
PCB 196 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,4,4’,5’,6- and 2,2’,3,4,4’,5,5’,6-Octachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1414 to 34.07 Range of Values 292 292
. Missing 9 301

LBD196LC - PCB 196 Comment Code

Variable Name:
LBD196LC
SAS Label:
PCB 196 Comment Code
English Text:
2,2’,3,3’,4,4’,5’,6- and 2,2’,3,4,4’,5,5’,6-Octachlorobiphenyl 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 286 286
1 Below lower detection limit 6 292
. Missing 9 301

LBC199 - PCB 199 (ng/g)

Variable Name:
LBC199
SAS Label:
PCB 199 (ng/g)
English Text:
2,2’,3,3’,4,5,6,6’-Octachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 224.4 Range of Values 292 292
. Missing 9 301

LBC199LA - PCB 199 Lipid Adj (ng/g)

Variable Name:
LBC199LA
SAS Label:
PCB 199 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,4,5,6,6’-Octachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1414 to 40.13 Range of Values 292 292
. Missing 9 301

LBD199LC - PCB 199 Comment Code

Variable Name:
LBD199LC
SAS Label:
PCB 199 Comment Code
English Text:
2,2’,3,3’,4,5,6,6’-Octachlorobiphenyl 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 280 280
1 Below lower detection limit 12 292
. Missing 9 301

LBC206 - PCB 206 (ng/g)

Variable Name:
LBC206
SAS Label:
PCB 206 (ng/g)
English Text:
2,2’,3,3’,4,4’,5,5’,6-Nonachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 127 Range of Values 301 301
. Missing 0 301

LBC206LA - PCB 206 Lipid Adj (ng/g)

Variable Name:
LBC206LA
SAS Label:
PCB 206 Lipid Adj (ng/g)
English Text:
2,2’,3,3’,4,4’,5,5’,6-Nonachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1414 to 21.85 Range of Values 301 301
. Missing 0 301

LBD206LC - PCB 206 Comment Code

Variable Name:
LBD206LC
SAS Label:
PCB 206 Comment Code
English Text:
2,2’,3,3’,4,4’,5,5’,6-Nonachlorobiphenyl 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 290 290
1 Below lower detection limit 11 301
. Missing 0 301

LBC209 - PCB 209 (ng/g)

Variable Name:
LBC209
SAS Label:
PCB 209 (ng/g)
English Text:
Decachlorobiphenyl (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.693 to 169.3 Range of Values 300 300
. Missing 1 301

LBC209LA - PCB 209 Lipid Adj (ng/g)

Variable Name:
LBC209LA
SAS Label:
PCB 209 Lipid Adj (ng/g)
English Text:
Decachlorobiphenyl Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.1202 to 29.11 Range of Values 300 300
. Missing 1 301

LBD209LC - PCB 209 Comment Code

Variable Name:
LBD209LC
SAS Label:
PCB 209 Comment Code
English Text:
Decachlorobiphenyl 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 237 237
1 Below lower detection limit 63 300
. Missing 1 301