National Health and Nutrition Examination Survey

2009-2010 Data Documentation, Codebook, and Frequencies

Volatile Organic Compounds (VOCs) - Blood (VOCWB_F)

Data File: VOCWB_F.xpt

First Published: April 2017

Last Revised: NA

Component Description

Volatile Organic Compounds (Whole Blood)

Volatile organic compounds (VOCs) are a large group of chemicals that have been used as solvents, degreasers, and cleaning agents in industry and consumer products. Many of the VOCs were found to contaminate ground water and drinking water sources. Because of human health concerns, these VOCs have been banned or restricted from most uses.

The halogenated solvents are VOCs consisting of a hydrocarbon chain or one hydrocarbon substituted with one or more chlorine or bromine atoms. Most of these chemicals are used as degreasers and solvents in various products such as paint. In the past, 1,1,1-trichloroethane was used as a dry cleaning agent, insect fumigant, and solvent in consumer products. Methylene chloride, perchloroethylene, and trichloroethene are other VOCs that were widely used in the past.

Benzene, toluene, ethylbenzene, xylene, and styrene, collectively referred to as BTEXS, are components of tobacco smoke. Along with 2,5-dimethyl furan, these VOCs are usually detected in the blood of cigarette smokers at higher levels than in non-smokers. Chlorobenzene (monochlorobenzene) and the three dichlorobenzenes are halogenated aromatic hydrocarbons primarily used in industrial and chemical synthetic processes. Chlorobenzene has been used to produce DDT, phenol, and nitrobenzene. The dichlorobenzenes are also chemical intermediates in the synthesis of dyes, pesticides, and other industrial products. 1,4-Dichlorobenzene (para-dichlorobenzene) is used also as a moth repellent and as a deodorizer. Disinfection by-products (DBP), including bromodichloromethane, dibromochloromethane, bromoform, and chloroform are formed when chlorine interacts with natural organic materials found in water. Primary sources of DBPs are chlorinated drinking water and recreational water bodies, such as swimming pools.

Inhalation is the most common VOC route of exposure in the general population, including indoor sources such as paints, adhesives, cleaning solutions, and aerosolized insecticide sprays; industries producing these solvents; and contaminated waste disposal sites. Drinking water may contribute to exposure when underground drinking water supplies are contaminated. After they are absorbed in the body, VOCs are rapidly eliminated in exhaled breath, or may be rapidly metabolized and eliminated in the urine.

Eligible Sample

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

Description of Laboratory Methodology

An automated analytical method was developed using capillary gas chromatography (GC) and mass spectrometry (MS) with selected-ion monitoring (SIM) detection and isotope-dilution. This method quantifies levels of individual VOCs in whole blood to low-parts-per-trillion range. Because non-occupationally exposed individuals have blood VOC concentrations within this range, this method is applicable for determining these quantities and investigating cases of sustained or recent low-level exposure.

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

There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2009-2010 cycle.

Laboratory Method Files

VOCWB_F_MET_Volatile_Organic_Compounds_(VOCs)_Blood.pdf (April 2017)

Laboratory Quality Assurance and Monitoring

Whole blood 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 refrigerated (2-8°C) 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 Amendments 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 CDC/NCEH Tobacco and Volatile Branch 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.

Volatile Toxicant Questionnaire

A volatile toxicant questionnaire (VTQ) was administered on the mobile examination center (MEC), by trained interviewers, using the Computer-Assisted Personal Interview (CAPI) system. The VTQ section includes data about the SP’s home, activities, amount of time spent in various locations, and exposure to different chemicals over the past 48 hours. This questionnaire data can be used in conjunction with the VOC laboratory dataset and found in the Volatile Toxicant Data File in the NHANES 2009-2010 Questionnaire Data section.

Subsample Weights

Whole blood VOCs were measured in a one-half 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.

Demographic and Other Related Variables

The analysis of NHANES laboratory data must be conducted using the appropriate survey design and demographic variables. The NHANES 2009-2010 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, the 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

The detection limits were constant for all of the analytes in the data set. Two variables are provided for each of these analytes. The variable name ending in “LC” (ex., LBD2DFLC) 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., LBD2DFLC=1), an imputed fill value was placed in the analyte results field. This value is the lower limit of detection divided by square root of 2 (LLOD/sqrt [2]). The other variable prefixed LBX (ex., LBX2DF) provides the analytic result for that analyte.

Lower Limit of Detection (LLOD, in ng/mL) for Whole Blood VOCs
VARIABLE NAME	SAS LABEL	LLOD
LBX2DF	Blood 2,5-Dimethylfuran (ng/mL)	0.0110
LBX4CE	Blood 1,1,1,2-Tetrachloroethane (ng/mL)	0.0400
LBXV06	Blood Hexane (ng/mL)	0.1220
LBXV1A	Blood 1,1-Dichloroethane (ng/mL)	0.0100
LBXV1D	Blood 1,2-Dichlorobenzene (ng/mL)	0.0250
LBXV1E	Blood 1,1-Dichloroethylene (ng/mL)	0.0090
LBXV2A	Blood 1,2-Dichloroethane (ng/mL)	0.0100
LBXV2C	Blood cis-1,2-Dichloroethylene (ng/mL)	0.0100
LBXV2E	Blood 1,1,2-Trichloroethane (ng/mL)	0.0100
LBXV2P	Bld 1,2-Dibromo-3-Chloropropane (ng/mL)	0.1000
LBXV2T	Blood trans-1,2-Dichloroethylene (ng/mL)	0.0100
LBXV3B	Blood 1,3-Dichlorobenzene (ng/mL)	0.0250
LBXV4C	Blood Tetrachloroethene (ng/mL)	0.0480
LBXV4E	Blood 1,1,2,2-Tetrachloroethane (ng/mL)	0.0100
LBXVBZ	Blood Benzene (ng/mL)	0.0240
LBXVCB	Blood Chlorobenzene (ng/mL)	0.0110
LBXVCT	Blood Carbon Tetrachloride (ng/mL)	0.0050
LBXVDB	Blood 1,4-Dichlorobenzene (ng/mL)	0.0400
LBXVDE	Blood 1,2-Dibromoethane (ng/ml)	0.0150
LBXVDM	Blood Dibromomethane (ng/mL)	0.0300
LBXVDP	Blood 1,2-Dichloropropane (ng/mL)	0.0100
LBXVDX	Blood 1,4-Dioxane (ng/mL)	0.5000
LBXVEB	Blood Ethylbenzene (ng/mL)	0.0240
LBXVFN	Blood Furan (ng/ml)	0.0250
LBXVHE	Blood Hexachloroethane (ng/mL)	0.0110
LBXVIPB	Blood Isopropylbenzene (ng/ml)	0.0400
LBXVMC	Blood Methylene Chloride(ng/mL)	0.2500
LBXVNB	Blood Nitrobenzene (ng/mL)	0.3200
LBXVOX	Blood o-Xylene (ng/mL)	0.0240
LBXVST	Blood Styrene (ng/mL)	0.0300
LBXVTC	Blood Trichloroethene (ng/mL)	0.0120
LBXVTE	Blood 1,1,1-Trichloroethane (ng/mL)	0.0100
LBXVTO	Blood Toluene (ng/mL)	0.0250
LBXVTP	Blood 1,2,3-Trichloropropane (ng/ml)	0.0400
LBXVXY	Blood m-/p-Xylene (ng/mL)	0.0340

References

Caudill, S.P., Schleicher, R.L., Pirkle, J.L. Multi-rule quality control for the age-related eye disease study. Statist. Med. (2008) 27(20):4094-40106.
Westgard J.O., Barry P.L., Hunt M.R., Groth T. A multi-rule Shewhart chart for quality control in clinical chemistry. Clin Chem (1981) 27:493-501.

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:: SEQN
SAS Label:: Respondent sequence number
English Text:: Respondent sequence number.
Target:: Both males and females 12 YEARS - 150 YEARS

WTSVOC2Y - VOC Subsample Weight

Variable Name:: WTSVOC2Y
SAS Label:: VOC Subsample Weight
English Text:: VOC Subsample Weight
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
7930.7314837 to 335126.1522	Range of Values	3736	3736
0	No Lab Result	9	3745
.	Missing	0	3745

LBX2DF - Blood 2,5-Dimethylfuran (ng/mL)

Variable Name:: LBX2DF
SAS Label:: Blood 2,5-Dimethylfuran (ng/mL)
English Text:: Blood 2,5-Dimethylfuran (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0078 to 0.741	Range of Values	3332	3332
.	Missing	413	3745

LBD2DFLC - Blood 2,5-Dimethylfuran Comment Code

Variable Name:: LBD2DFLC
SAS Label:: Blood 2,5-Dimethylfuran Comment Code
English Text:: Blood 2,5-Dimethylfuran Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	613	613
1	Below lower detection limit	2719	3332
2	Detectable result and exceeds the calibrated range of assay	0	3332
.	Missing	413	3745

LBX4CE - Blood 1,1,1,2-Tetrachloroethane (ng/mL)

Variable Name:: LBX4CE
SAS Label:: Blood 1,1,1,2-Tetrachloroethane (ng/mL)
English Text:: Blood 1,1,1,2-Tetrachloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0283	0.0283	3280	3280
.	Missing	465	3745

LBD4CELC - Blood 1,1,1,2-Tetrachloroethane Cmt Code

Variable Name:: LBD4CELC
SAS Label:: Blood 1,1,1,2-Tetrachloroethane Cmt Code
English Text:: Blood 1,1,1,2-Tetrachloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3280	3280
2	Detectable result and exceeds the calibrated range of assay	0	3280
.	Missing	465	3745

LBXV06 - Blood Hexane (ng/mL)

Variable Name:: LBXV06
SAS Label:: Blood Hexane (ng/mL)
English Text:: Blood Hexane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0863 to 111	Range of Values	3266	3266
.	Missing	479	3745

LBDV06LC - Blood Hexane Comment Code

Variable Name:: LBDV06LC
SAS Label:: Blood Hexane Comment Code
English Text:: Blood Hexane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	41	41
1	Below lower detection limit	3225	3266
2	Detectable result and exceeds the calibrated range of assay	0	3266
.	Missing	479	3745

LBXV1A - Blood 1,1-Dichloroethane (ng/mL)

Variable Name:: LBXV1A
SAS Label:: Blood 1,1-Dichloroethane (ng/mL)
English Text:: Blood 1,1-Dichloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.0071	Range of Values	3330	3330
.	Missing	415	3745

LBDV1ALC - Blood 1,1-Dichloroethane Comment Code

Variable Name:: LBDV1ALC
SAS Label:: Blood 1,1-Dichloroethane Comment Code
English Text:: Blood 1,1-Dichloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3330	3330
2	Detectable result and exceeds the calibrated range of assay	0	3330
.	Missing	415	3745

LBXV1D - Blood 1,2-Dichlorobenzene (ng/mL)

Variable Name:: LBXV1D
SAS Label:: Blood 1,2-Dichlorobenzene (ng/mL)
English Text:: Blood 1,2-Dichlorobenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0177 to 0.029	Range of Values	3074	3074
.	Missing	671	3745

LBDV1DLC - Blood 1,2-Dichlorobenzene Comment Code

Variable Name:: LBDV1DLC
SAS Label:: Blood 1,2-Dichlorobenzene Comment Code
English Text:: Blood 1,2-Dichlorobenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1	1
1	Below lower detection limit	3073	3074
2	Detectable result and exceeds the calibrated range of assay	0	3074
.	Missing	671	3745

LBXV1E - Blood 1,1-Dichloroethene (ng/mL)

Variable Name:: LBXV1E
SAS Label:: Blood 1,1-Dichloroethene (ng/mL)
English Text:: Blood 1,1-Dichloroethene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0064 to 0.0064	Range of Values	3133	3133
.	Missing	612	3745

LBDV1ELC - Blood 1,1-Dichloroethene Comment Code

Variable Name:: LBDV1ELC
SAS Label:: Blood 1,1-Dichloroethene Comment Code
English Text:: Blood 1,1-Dichloroethene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3133	3133
2	Detectable result and exceeds the calibrated range of assay	0	3133
.	Missing	612	3745

LBXV2A - Blood 1,2-Dichloroethane (ng/mL)

Variable Name:: LBXV2A
SAS Label:: Blood 1,2-Dichloroethane (ng/mL)
English Text:: Blood 1,2-Dichloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.084	Range of Values	3358	3358
.	Missing	387	3745

LBDV2ALC - Blood 1,2-Dichloroethane Comment Code

Variable Name:: LBDV2ALC
SAS Label:: Blood 1,2-Dichloroethane Comment Code
English Text:: Blood 1,2-Dichloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	68	68
1	Below lower detection limit	3290	3358
2	Detectable result and exceeds the calibrated range of assay	0	3358
.	Missing	387	3745

LBXV2C - Blood cis-1,2-Dichloroethene (ng/mL)

Variable Name:: LBXV2C
SAS Label:: Blood cis-1,2-Dichloroethene (ng/mL)
English Text:: Blood cis-1,2-Dichloroethene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.0071	Range of Values	3313	3313
.	Missing	432	3745

LBDV2CLC - Blood cis-1,2-Dichloroethene Comt Code

Variable Name:: LBDV2CLC
SAS Label:: Blood cis-1,2-Dichloroethene Comt Code
English Text:: Blood cis-1,2-Dichloroethene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3313	3313
2	Detectable result and exceeds the calibrated range of assay	0	3313
.	Missing	432	3745

LBXV2E - Blood 1,1,2-Trichloroethane (ng/mL)

Variable Name:: LBXV2E
SAS Label:: Blood 1,1,2-Trichloroethane (ng/mL)
English Text:: Blood 1,1,2-Trichloroethane(ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.0071	Range of Values	3240	3240
.	Missing	505	3745

LBDV2ELC - Blood 1,1,2-Trichloroethane Comment Code

Variable Name:: LBDV2ELC
SAS Label:: Blood 1,1,2-Trichloroethane Comment Code
English Text:: Blood 1,1,2-Trichloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3240	3240
2	Detectable result and exceeds the calibrated range of assay	0	3240
.	Missing	505	3745

LBXV2P - Blood 1,2-Dibromo-3-Chloropropane(ng/mL)

Variable Name:: LBXV2P
SAS Label:: Blood 1,2-Dibromo-3-Chloropropane(ng/mL)
English Text:: Blood 1,2-Dibromo-3-Chloropropane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0707	0.0707	3391	3391
.	Missing	354	3745

LBDV2PLC - Blood 1,2-Dibromo-3-Chloropropane Comt

Variable Name:: LBDV2PLC
SAS Label:: Blood 1,2-Dibromo-3-Chloropropane Comt
English Text:: Blood 1,2-Dibromo-3-Chloropropane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3391	3391
2	Detectable result and exceeds the calibrated range of assay	0	3391
.	Missing	354	3745

LBXV2T - Blood trans-1,2-Dichloroethene (ng/mL)

Variable Name:: LBXV2T
SAS Label:: Blood trans-1,2-Dichloroethene (ng/mL)
English Text:: Blood trans-1,2-Dichloroethene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.825	Range of Values	3241	3241
.	Missing	504	3745

LBDV2TLC - Blood trans-1,2-Dichloroethene Comt Code

Variable Name:: LBDV2TLC
SAS Label:: Blood trans-1,2-Dichloroethene Comt Code
English Text:: Blood trans-1,2-Dichloroethene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	4	4
1	Below lower detection limit	3237	3241
2	Detectable result and exceeds the calibrated range of assay	0	3241
.	Missing	504	3745

LBXV3B - Blood 1,3-Dichlorobenzene (ng/mL)

Variable Name:: LBXV3B
SAS Label:: Blood 1,3-Dichlorobenzene (ng/mL)
English Text:: Blood 1,3-Dichlorobenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0177 to 0.0177	Range of Values	3294	3294
.	Missing	451	3745

LBDV3BLC - Blood 1,3-Dichlorobenzene Comment Code

Variable Name:: LBDV3BLC
SAS Label:: Blood 1,3-Dichlorobenzene Comment Code
English Text:: Blood 1,3-Dichlorobenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3294	3294
2	Detectable result and exceeds the calibrated range of assay	0	3294
.	Missing	451	3745

LBXV4C - Blood Tetrachloroethene (ng/mL)

Variable Name:: LBXV4C
SAS Label:: Blood Tetrachloroethene (ng/mL)
English Text:: Blood Tetrachloroethene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0339 to 6.94	Range of Values	3302	3302
.	Missing	443	3745

LBDV4CLC - Blood Tetrachloroethene Comment Code

Variable Name:: LBDV4CLC
SAS Label:: Blood Tetrachloroethene Comment Code
English Text:: Blood Tetrachloroethene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	435	435
1	Below lower detection limit	2867	3302
2	Detectable result and exceeds the calibrated range of assay	0	3302
.	Missing	443	3745

LBXV4E - Blood 1,1,2,2-Tetrachloroethane (ng/mL)

Variable Name:: LBXV4E
SAS Label:: Blood 1,1,2,2-Tetrachloroethane (ng/mL)
English Text:: Blood 1,1,2,2-Tetrachloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.0071	Range of Values	3371	3371
.	Missing	374	3745

LBDV4ELC - Blood 1,1,2,2-Tetrachloroethane Cmt Code

Variable Name:: LBDV4ELC
SAS Label:: Blood 1,1,2,2-Tetrachloroethane Cmt Code
English Text:: Blood 1,1,2,2-Tetrachloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3371	3371
2	Detectable result and exceeds the calibrated range of assay	0	3371
.	Missing	374	3745

LBXVBZ - Blood Benzene (ng/mL)

Variable Name:: LBXVBZ
SAS Label:: Blood Benzene (ng/mL)
English Text:: Blood Benzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.017 to 1.43	Range of Values	3236	3236
.	Missing	509	3745

LBDVBZLC - Blood Benzene Comment Code

Variable Name:: LBDVBZLC
SAS Label:: Blood Benzene Comment Code
English Text:: Blood Benzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	900	900
1	Below lower detection limit	2336	3236
2	Detectable result and exceeds the calibrated range of assay	0	3236
.	Missing	509	3745

LBXVCB - Blood Chlorobenzene (ng/mL)

Variable Name:: LBXVCB
SAS Label:: Blood Chlorobenzene (ng/mL)
English Text:: Blood Chlorobenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0078 to 0.172	Range of Values	3236	3236
.	Missing	509	3745

LBDVCBLC - Blood Chlorobenzene Comment Code

Variable Name:: LBDVCBLC
SAS Label:: Blood Chlorobenzene Comment Code
English Text:: Blood Chlorobenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	4	4
1	Below lower detection limit	3232	3236
2	Detectable result and exceeds the calibrated range of assay	0	3236
.	Missing	509	3745

LBXVCT - Blood Carbon Tetrachloride (ng/mL)

Variable Name:: LBXVCT
SAS Label:: Blood Carbon Tetrachloride (ng/mL)
English Text:: Blood Carbon Tetrachloride (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0035 to 0.049	Range of Values	3240	3240
.	Missing	505	3745

LBDVCTLC - Blood Carbon Tetrachloride Comment Code

Variable Name:: LBDVCTLC
SAS Label:: Blood Carbon Tetrachloride Comment Code
English Text:: Blood Carbon Tetrachloride Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	4	4
1	Below lower detection limit	3236	3240
2	Detectable result and exceeds the calibrated range of assay	0	3240
.	Missing	505	3745

LBXVDB - Blood 1,4-Dichlorobenzene (ng/mL)

Variable Name:: LBXVDB
SAS Label:: Blood 1,4-Dichlorobenzene (ng/mL)
English Text:: Blood 1,4-Dichlorobenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0283 to 194	Range of Values	3205	3205
.	Missing	540	3745

LBDVDBLC - Blood 1,4-Dichlorobenzene Comment Code

Variable Name:: LBDVDBLC
SAS Label:: Blood 1,4-Dichlorobenzene Comment Code
English Text:: Blood 1,4-Dichlorobenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1776	1776
1	Below lower detection limit	1429	3205
2	Detectable result and exceeds the calibrated range of assay	0	3205
.	Missing	540	3745

LBXVDE - Blood 1,2-Dibromoethane (ng/mL)

Variable Name:: LBXVDE
SAS Label:: Blood 1,2-Dibromoethane (ng/mL)
English Text:: Blood 1,2-Dibromoethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0106	0.0106	3212	3212
.	Missing	533	3745

LBDVDELC - Blood 1,2-Dibromoethane Comment Code

Variable Name:: LBDVDELC
SAS Label:: Blood 1,2-Dibromoethane Comment Code
English Text:: Blood 1,2-Dibromoethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3212	3212
2	Detectable result and exceeds the calibrated range of assay	0	3212
.	Missing	533	3745

LBXVDM - Blood Dibromomethane (ng/mL)

Variable Name:: LBXVDM
SAS Label:: Blood Dibromomethane (ng/mL)
English Text:: Blood Dibromomethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0212 to 0.288	Range of Values	3243	3243
.	Missing	502	3745

LBDVDMLC - Blood Dibromomethane Comment Code

Variable Name:: LBDVDMLC
SAS Label:: Blood Dibromomethane Comment Code
English Text:: Blood Dibromomethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	5	5
1	Below lower detection limit	3238	3243
2	Detectable result and exceeds the calibrated range of assay	0	3243
.	Missing	502	3745

LBXVDP - Blood 1,2-Dichloropropane (ng/mL)

Variable Name:: LBXVDP
SAS Label:: Blood 1,2-Dichloropropane (ng/mL)
English Text:: Blood 1,2-Dichloropropane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.018	Range of Values	3255	3255
.	Missing	490	3745

LBDVDPLC - Blood 1,2-Dichloropropane Comment Code

Variable Name:: LBDVDPLC
SAS Label:: Blood 1,2-Dichloropropane Comment Code
English Text:: Blood 1,2-Dichloropropane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1	1
1	Below lower detection limit	3254	3255
2	Detectable result and exceeds the calibrated range of assay	0	3255
.	Missing	490	3745

LBXVDX - Blood 1,4-Dioxane (ng/mL)

Variable Name:: LBXVDX
SAS Label:: Blood 1,4-Dioxane (ng/mL)
English Text:: Blood 1,4-Dioxane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.3536	0.3536	2474	2474
.	Missing	1271	3745

LBDVDXLC - Blood 1,4-Dioxane Comment Code

Variable Name:: LBDVDXLC
SAS Label:: Blood 1,4-Dioxane Comment Code
English Text:: Blood 1,4-Dioxane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	2474	2474
2	Detectable result and exceeds the calibrated range of assay	0	2474
.	Missing	1271	3745

LBXVEB - Blood Ethylbenzene (ng/mL)

Variable Name:: LBXVEB
SAS Label:: Blood Ethylbenzene (ng/mL)
English Text:: Blood Ethylbenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.017 to 8.49	Range of Values	3209	3209
.	Missing	536	3745

LBDVEBLC - Blood Ethylbenzene Comment Code

Variable Name:: LBDVEBLC
SAS Label:: Blood Ethylbenzene Comment Code
English Text:: Blood Ethylbenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1392	1392
1	Below lower detection limit	1817	3209
2	Detectable result and exceeds the calibrated range of assay	0	3209
.	Missing	536	3745

LBXVFN - Blood Furan (ng/mL)

Variable Name:: LBXVFN
SAS Label:: Blood Furan (ng/mL)
English Text:: Blood Furan (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0177 to 0.47	Range of Values	3167	3167
.	Missing	578	3745

LBDVFNLC - Blood Furan Comment Code

Variable Name:: LBDVFNLC
SAS Label:: Blood Furan Comment Code
English Text:: Blood Furan Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	479	479
1	Below lower detection limit	2688	3167
2	Detectable result and exceeds the calibrated range of assay	0	3167
.	Missing	578	3745

LBXVHE - Blood Hexachloroethane (ng/mL)

Variable Name:: LBXVHE
SAS Label:: Blood Hexachloroethane (ng/mL)
English Text:: Blood Hexachloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0078 to 0.025	Range of Values	2652	2652
.	Missing	1093	3745

LBDVHELC - Blood Hexachloroethane Comment Code

Variable Name:: LBDVHELC
SAS Label:: Blood Hexachloroethane Comment Code
English Text:: Blood Hexachloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1	1
1	Below lower detection limit	2651	2652
2	Detectable result and exceeds the calibrated range of assay	0	2652
.	Missing	1093	3745

LBXVIPB - Blood Isopropylbenzene (ng/mL)

Variable Name:: LBXVIPB
SAS Label:: Blood Isopropylbenzene (ng/mL)
English Text:: Blood Isopropylbenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0283 to 0.49	Range of Values	3250	3250
.	Missing	495	3745

LBDVIPLC - Blood Isopropylbenzene Comment Code

Variable Name:: LBDVIPLC
SAS Label:: Blood Isopropylbenzene Comment Code
English Text:: Blood Isopropylbenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	33	33
1	Below lower detection limit	3217	3250
2	Detectable result and exceeds the calibrated range of assay	0	3250
.	Missing	495	3745

LBXVMC - Blood Methylene Chloride (ng/mL)

Variable Name:: LBXVMC
SAS Label:: Blood Methylene Chloride (ng/mL)
English Text:: Blood Methylene Chloride (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.1768 to 1.79	Range of Values	2878	2878
.	Missing	867	3745

LBDVMCLC - Blood Methylene Chloride Comment Code

Variable Name:: LBDVMCLC
SAS Label:: Blood Methylene Chloride Comment Code
English Text:: Blood Methylene Chloride Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	11	11
1	Below lower detection limit	2867	2878
2	Detectable result and exceeds the calibrated range of assay	0	2878
.	Missing	867	3745

LBXVNB - Blood Nitrobenzene (ng/mL)

Variable Name:: LBXVNB
SAS Label:: Blood Nitrobenzene (ng/mL)
English Text:: Blood Nitrobenzene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.2263 to 0.2263	Range of Values	3200	3200
.	Missing	545	3745

LBDVNBLC - Blood Nitrobenzene Comment Code

Variable Name:: LBDVNBLC
SAS Label:: Blood Nitrobenzene Comment Code
English Text:: Blood Nitrobenzene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3200	3200
2	Detectable result and exceeds the calibrated range of assay	0	3200
.	Missing	545	3745

LBXVOX - Blood o-Xylene (ng/mL)

Variable Name:: LBXVOX
SAS Label:: Blood o-Xylene (ng/mL)
English Text:: Blood o-Xylene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.017 to 7.91	Range of Values	2944	2944
.	Missing	801	3745

LBDVOXLC - Blood o-Xylene Comment Code

Variable Name:: LBDVOXLC
SAS Label:: Blood o-Xylene Comment Code
English Text:: Blood o-Xylene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1325	1325
1	Below lower detection limit	1619	2944
2	Detectable result and exceeds the calibrated range of assay	0	2944
.	Missing	801	3745

LBXVST - Blood Styrene (ng/mL)

Variable Name:: LBXVST
SAS Label:: Blood Styrene (ng/mL)
English Text:: Blood Styrene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0212 to 146	Range of Values	1320	1320
.	Missing	2425	3745

LBDVSTLC - Blood Styrene Comment Code

Variable Name:: LBDVSTLC
SAS Label:: Blood Styrene Comment Code
English Text:: Blood Styrene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	574	574
1	Below lower detection limit	746	1320
2	Detectable result and exceeds the calibrated range of assay	0	1320
.	Missing	2425	3745

LBXVTC - Blood Trichloroethene (ng/mL)

Variable Name:: LBXVTC
SAS Label:: Blood Trichloroethene (ng/mL)
English Text:: Blood Trichloroethene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0085 to 0.576	Range of Values	3342	3342
.	Missing	403	3745

LBDVTCLC - Blood Trichloroethene Comment Code

Variable Name:: LBDVTCLC
SAS Label:: Blood Trichloroethene Comment Code
English Text:: Blood Trichloroethene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	27	27
1	Below lower detection limit	3315	3342
2	Detectable result and exceeds the calibrated range of assay	0	3342
.	Missing	403	3745

LBXVTE - Blood 1,1,1-Trichloroethane (ng/mL)

Variable Name:: LBXVTE
SAS Label:: Blood 1,1,1-Trichloroethane (ng/mL)
English Text:: Blood 1,1,1-Trichloroethane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0071 to 0.197	Range of Values	3333	3333
.	Missing	412	3745

LBDVTELC - Blood 1,1,1-Trichloroethane Comment Code

Variable Name:: LBDVTELC
SAS Label:: Blood 1,1,1-Trichloroethane Comment Code
English Text:: Blood 1,1,1-Trichloroethane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	35	35
1	Below lower detection limit	3298	3333
2	Detectable result and exceeds the calibrated range of assay	0	3333
.	Missing	412	3745

LBXVTO - Blood Toluene (ng/mL)

Variable Name:: LBXVTO
SAS Label:: Blood Toluene (ng/mL)
English Text:: Blood Toluene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0177 to 56.3	Range of Values	2185	2185
.	Missing	1560	3745

LBDVTOLC - Blood Toluene Comment Code

Variable Name:: LBDVTOLC
SAS Label:: Blood Toluene Comment Code
English Text:: Blood Toluene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	1905	1905
1	Below lower detection limit	280	2185
2	Detectable result and exceeds the calibrated range of assay	0	2185
.	Missing	1560	3745

LBXVTP - Blood 1,2,3-Trichloropropane (ng/mL)

Variable Name:: LBXVTP
SAS Label:: Blood 1,2,3-Trichloropropane (ng/mL)
English Text:: Blood 1,2,3-Trichloropropane (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.0283	0.0283	3260	3260
.	Missing	485	3745

LBDVTPLC - Blood 1,2,3-Trichloropropane Comt Code

Variable Name:: LBDVTPLC
SAS Label:: Blood 1,2,3-Trichloropropane Comt Code
English Text:: Blood 1,2,3-Trichloropropane Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	0	0
1	Below lower detection limit	3260	3260
2	Detectable result and exceeds the calibrated range of assay	0	3260
.	Missing	485	3745

LBXVXY - Blood m-/p-Xylene (ng/mL)

Variable Name:: LBXVXY
SAS Label:: Blood m-/p-Xylene (ng/mL)
English Text:: Blood m-/p-Xylene (ng/mL)
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
0.024 to 21.8	Range of Values	3138	3138
.	Missing	607	3745

LBDVXYLC - Blood m-/p-Xylene Comment Code

Variable Name:: LBDVXYLC
SAS Label:: Blood m-/p-Xylene Comment Code
English Text:: Blood m-/p-Xylene Comment Code
Target:: Both males and females 12 YEARS - 150 YEARS

Code or Value	Value Description	Count	Cumulative
0	At or above detection limit	2595	2595
1	Below lower detection limit	543	3138
2	Detectable result and exceeds the calibrated range of assay	0	3138
.	Missing	607	3745

Table of Contents