Table of Contents

Component Description

Organochlorine pesticides are a diverse group of synthetic chemicals that persist in the environment and tend to bioaccumulate. Most of these chemicals have been banned from use in the U.S. Assessment of exposure to persistent organochlorine pesticides in a representative sample of the U.S. population is needed to determine current prevalence and level of exposure and the potential for human health effects from exposure to these chemicals.

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. Eight organochlorine pesticides and metabolites 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

Pesticides - Organochlorine Pesticides (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

Organochlorine pesticides 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 2144 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, 1940 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.,LBDBHCLC) 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., LBDBHCLC =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., LBCBHC) 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., LBCBHCLA) 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)

LBCHCB

HCB

Hexachlorobenzene

6.7

1.7

LBCBHC

B-HCCH

BETA-Hexachlorocyclohexane

3.5

0.92

LBCGHC

G-HCCH

GAMA-Hexachlorocyclohexane (Lindane)

3.5

0.92

LBCOXY

OXYCHLOR

Oxychlordane

3.5

0.92

LBCTNA

T-NONA

Trans-Nonachlor

3.5

0.92

LBCPDE

PP-DDE

2,2-Bis(4-chlorophenyl)-1,1-dichloroethene

12

3.1

LBCPDT

PP-DDT

2,2-Bis(4-chlorophenyl-1,1,1-trichloroethan

3.5

0.92

LBCMIR

MIREX

Mirex

3.5

0.92

 

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

LBCBHC - Beta-hexachlorocyclohexane (pg/g)

Variable Name:
LBCBHC
SAS Label:
Beta-hexachlorocyclohexane (pg/g)
English Text:
Beta-hexachlorocyclohexane (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.536 to 5401 Range of Values 251 251
. Missing 0 251

LBCBHCLA - B-hexachlorocyclohexane Lipid Adj (ng/g)

Variable Name:
LBCBHCLA
SAS Label:
B-hexachlorocyclohexane Lipid Adj (ng/g)
English Text:
Beta-hexachlorocyclohexane Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5303 to 914.3 Range of Values 251 251
. Missing 0 251

LBDBHCLC - Beta-hexachlorocyclohexane comment code

Variable Name:
LBDBHCLC
SAS Label:
Beta-hexachlorocyclohexane comment code
English Text:
Beta-hexachlorocyclohexane 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 207 207
1 Below lower detection limit 44 251
. Missing 0 251

LBCGHC - Gamma-hexachlorocyclohexane (pg/g)

Variable Name:
LBCGHC
SAS Label:
Gamma-hexachlorocyclohexane (pg/g)
English Text:
Gamma-hexachlorocyclohexane (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.465 to 8.949 Range of Values 251 251
. Missing 0 251

LBCGHCLA - G-hexachlorocyclohexane Lipid Adj (ng/g)

Variable Name:
LBCGHCLA
SAS Label:
G-hexachlorocyclohexane Lipid Adj (ng/g)
English Text:
Gamma-hexachlorocyclohexane Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.3677 to 1.39 Range of Values 251 251
. Missing 0 251

LBDGHCLC - Gamma-hexachlorocyclohexane comment code

Variable Name:
LBDGHCLC
SAS Label:
Gamma-hexachlorocyclohexane comment code
English Text:
Gamma-hexachlorocyclohexane 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 1 1
1 Below lower detection limit 250 251
. Missing 0 251

LBCHCB - Hexachlorobenzene (pg/g)

Variable Name:
LBCHCB
SAS Label:
Hexachlorobenzene (pg/g)
English Text:
Hexachlorobenzene (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
18.67 to 244.4 Range of Values 251 251
. Missing 0 251

LBCHCBLA - Hexachlorobenzene Lipid Adj (ng/g)

Variable Name:
LBCHCBLA
SAS Label:
Hexachlorobenzene Lipid Adj (ng/g)
English Text:
Hexachlorobenzene Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
4.097 to 37.09 Range of Values 251 251
. Missing 0 251

LBDHCBLC - Hexachlorobenzene comment code

Variable Name:
LBDHCBLC
SAS Label:
Hexachlorobenzene comment code
English Text:
Hexachlorobenzene 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

LBCMIR - Mirex (pg/g)

Variable Name:
LBCMIR
SAS Label:
Mirex (pg/g)
English Text:
Mirex (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.536 to 194.7 Range of Values 251 251
. Missing 0 251

LBCMIRLA - Mirex Lipid Adj (ng/g)

Variable Name:
LBCMIRLA
SAS Label:
Mirex Lipid Adj (ng/g)
English Text:
Mirex Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5162 to 30.82 Range of Values 251 251
. Missing 0 251

LBDMIRLC - Mirex comment code

Variable Name:
LBDMIRLC
SAS Label:
Mirex comment code
English Text:
Mirex 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 164 164
1 Below lower detection limit 87 251
. Missing 0 251

LBCOXY - Oxychlordane (pg/g)

Variable Name:
LBCOXY
SAS Label:
Oxychlordane (pg/g)
English Text:
Oxychlordane (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.536 to 305.6 Range of Values 251 251
. Missing 0 251

LBCOXYLA - Oxychlordane Lipid Adj (ng/g)

Variable Name:
LBCOXYLA
SAS Label:
Oxychlordane Lipid Adj (ng/g)
English Text:
Oxychlordane Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.6647 to 57.84 Range of Values 251 251
. Missing 0 251

LBDOXYLC - Oxychlordane comment code

Variable Name:
LBDOXYLC
SAS Label:
Oxychlordane comment code
English Text:
Oxychlordane 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 6 251
. Missing 0 251

LBCPDE - p,p'-DDE (pg/g)

Variable Name:
LBCPDE
SAS Label:
p,p'-DDE (pg/g)
English Text:
p,p'-dichlorodiphenyltrichloroethene (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
105.3 to 35960 Range of Values 250 250
. Missing 1 251

LBCPDELA - p,p'-DDE Lipid Adj (ng/g)

Variable Name:
LBCPDELA
SAS Label:
p,p'-DDE Lipid Adj (ng/g)
English Text:
p,p'-dichlorodiphenyltrichloroethene Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
24.18 to 5338 Range of Values 250 250
. Missing 1 251

LBDPDELC - p,p'-DDE comment code

Variable Name:
LBDPDELC
SAS Label:
p,p'-DDE comment code
English Text:
p,p'-dichlorodiphenyltrichloroethene 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 250 250
1 Below lower detection limit 0 250
. Missing 1 251

LBCPDT - p,p'-DDT (pg/g)

Variable Name:
LBCPDT
SAS Label:
p,p'-DDT (pg/g)
English Text:
p,p'-dichlorodiphenyltrichlorethane (p/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.536 to 1196 Range of Values 251 251
. Missing 0 251

LBCPDTLA - p,p'-DDT Lipid Adj (ng/g)

Variable Name:
LBCPDTLA
SAS Label:
p,p'-DDT Lipid Adj (ng/g)
English Text:
p,p'-dichlorodiphenyltrichlorethane Lipid Adjusted (ng/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.5515 to 177.6 Range of Values 251 251
. Missing 0 251

LBDPDTLC - p,p'-DDT comment code

Variable Name:
LBDPDTLC
SAS Label:
p,p'-DDT comment code
English Text:
p,p'-dichlorodiphenyltrichlorethane 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

LBCTNA - trans-Nonachlor (pg/g)

Variable Name:
LBCTNA
SAS Label:
trans-Nonachlor (pg/g)
English Text:
trans-Nonachlor (pg/g)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
3.536 to 770.4 Range of Values 251 251
. Missing 0 251

LBCTNALA - trans-Nonachlor Lipid Adj (ng/g)

Variable Name:
LBCTNALA
SAS Label:
trans-Nonachlor Lipid Adj (ng/g)
English Text:
trans-Nonachlor 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 139.3 Range of Values 251 251
. Missing 0 251

LBDTNALC - trans-Nonachlor comment code

Variable Name:
LBDTNALC
SAS Label:
trans-Nonachlor comment code
English Text:
trans-Nonachlor 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 249 249
1 Below lower detection limit 2 251
. Missing 0 251