Table of Contents

Locator Record

Title: Volatile Organic Compounds in Blood (VOCWB_D )
Contact Number: 1-866-441-NCHS
Years of Content: 2005 - 2006
First Published: December, 2011
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Volatile Organic Compounds in Blood and Related Questionnaire Items
Record Source: NHANES 2005 - 2006
Survey Methodology: NHANES 2005 - 2006 is a stratified multistage probability sample of the civilian non-institutionalized population of the U.S.
Medium: NHANES Web site; SAS transport files

Component Description

Both the lab data and questionnaire items will be released in this file.

Volatile Organic Compound Questions:

The volatile organic compound section of the Mobile Examination Center (MEC) Interview and Phlebotomy Component (PH) provide personal interview data.  

Volatile Organic Compounds (Human 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, and because of human health concerns, 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 paints. 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.

Methyl-tert-butyl ether (MTBE) was used as an additive to replace lead in gasoline, but its use was banned after widespread ground water contamination was discovered. Benzene, toluene, ethylbenzene, xylene, and  styrene, collectively referred to as BTEXS, are components of tobacco smoke and along with 2,5-dimethyl furan, these VOCs are usually detected in blood of cigarette smokers at higher levels than in non-smokers. Chlorobenzene (monochlorobenzene) and the three dichlorobenzenes are halogenated aromatic hydrocarbons pirmarily used in industrial and chemical synthetic processes. Chlorobenzene has been used to produce DDT, phenol, and nitrobenzene. The dichlorobenzenes are also chemical intermediates in 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 exposure route for the general population, including indoor sources from such as paints, adhesives, cleaning solutions, and aerosolized insecticide sprays; from industries producing these solvents; and from 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

Participants aged 12 years and older on a one-half sample had questions administered and whole blood specimens tested.

Description of Laboratory Methodology

Interview Setting and Mode of Administration

The questions were asked during the physical examination, in the mobile examination center (MEC). The questions were administered by the phlebotomist or the MEC interviewers.

Data Processing and Editing

Automated data collection procedures for the survey were introduced in NHANES 2003–2004. In the MECs and analytical laboratories, data for the laboratory component are recorded directly onto a computerized data collection form. The system is centrally integrated, and it allows for ongoing monitoring of much of the data. Although the complete blood count and pregnancy analyses are performed in the MEC laboratory, most analyses are conducted elsewhere by approximately 21 laboratories across the United States.

Guidelines have been developed that provide standards for naming variables, filling missing values, and handling missing records. NCHS staff, assisted by contract staff, has developed data-editing specifications that check data sets for valid codes, ranges, and skip-pattern consistencies and examine the consistency of values between interrelated variables. Comments have been reviewed and recoded. NCHS staff verifies extremely high and low values whenever possible, and numerous consistency checks are performed. Nonetheless, users should examine the range and frequency of values before analyzing data.

Data Editing

The data editing specifications are as follows:

Laboratory Quality Assurance and Monitoring

Mobile Examination Centers (MECs)

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

The NHANES QA/QC protocols meet the 1988 Clinical Laboratory Improvement Act mandates. Detailed QA/QC instructions are discussed in the NHANES LPM.

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 second examinations on previously examined participants and blind split samples collected on “dry run” sessions.

NCHS developed and distributed a quality control protocol for all the contract laboratories which outlined the Westgaard rules used 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 and Westat quarterly. The reports are reviewed for trends or shifts in the data. The laboratories are required to explain any identified areas of concern.

Analytic Notes

Measures of volatile organic compounds in blood and water were assessed in a subsample of participants aged 20 years and older. Use the special weights (WTSVOC2Y) included in this data file when analyzing data. Please refer to the Analytic Guidelines for further details on the use of sample weights and other analytic issues.

The analysis of NHANES laboratory data must be conducted with the key survey design and basic demographic variables. The recommended procedure for variance estimation requires use of stratum and PSU variables (SDMVSTRA and SDMVPSU, respectively), which are included in the demographic data file for each data release. The NHANES Questionnaire and Demographic Data Files contain demographic data, health indicators, and other related information collected during household interviews. The phlebotomy file includes auxiliary information such as the conditions precluding venipuncture. The demographic,  questionnaire and phlebotomy files may be linked to the laboratory data file using the unique survey participant identifier SEQN.

Detection limits

The detection limit was variable for two of the analytes in the data set. In addition two variables are provided for each of these analytes. The variable named LBD___LC indicates whether the result was below the limit of detection. There are three values: “0”, “1”, and “2”. “0” means that the result was at or above the limit of detection. “1” indicates that the result was below the limit of detection. “2” means the result was above the limit of detection and exceeds calibrated range of assay.

The other variable named LBX___ provides the analytic result for that analyte. 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 two.

 

Lower Limits of Detection
Analyte Lower Limit of Detecction
Blood 2,5-Dimethylfuran (ng/mL)" 0.011
Blood 1,1-Dichloroethane (ng/mL 0.01
Blood 1,2-Dichlorobenzene (ng/mL) 0.1
Blood 1,1-Dichloroethene (ng/mL)" 0.009
Blood 1,2-Dichloroethane (ng/mL 0.01
Blood cis-1,2-Dichloroethene (ng/mL) 0.01
Blood 1,1,2-Trichloroethene (ng/mL)" 0.01
Blood 1,2-Dibromo-3-chloropropane(ng/mL 0.1
Blood trans-1,2-Dichloroethene (ng/mL 0.01
Blood 1,3-Dichlorobenzene (ng/mL 0.05
Blood Tetrachloroethene (ng/mL 0.048
Blood 1,1,2,2-Tetrachloroethane (ng/mL)" 0.01
Blood Bromoform (pg/mL 1.5
Blood Bromodichloromethane (pg/mL 0.62
Blood Benzene (ng/mL) 0.024
Blood Chlorobenzene (ng/mL 0.011
Blood Chloroform (pg/mL 2.1
Blood Dibromochloromethane (pg/mL 0.62
Blood Carbon Tetrachloride (ng/mL 0.05
Blood 1,4-Dichlorobenzene (ng/mL 0.12
Blood Dibromomethane (ng/mL 0.03
Blood 1,2-Dichloropropane (ng/mL 0.008
Blood Ethylbenzene (ng/mL 0.024
Blood Hexachloroethane (ng/mL 0.011
Blood Methylene Chloride (ng/mL 0.07
Blood Methylene Chloride (ng/mL 0.25
Blood MTBE (pg/mL 1.4
Blood Nitrobenezene (ng/mL 0.3
Blood o-Xylene (ng/mL 0.024
Blood Styrene (ng/mL 0.03
Blood Trichloroethene (ng/mL 0.012
Blood Toluene (ng/mL 0.025
1,1,1-Trichloroethane 0.01
1,1,1-Trichloroethane 0.05
Blood m-/p-Xylene (ng/mL 0.034

References

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 2 yr MEC Weight

Variable Name:
WTSVOC2Y
SAS Label:
VOC subsample 2 yr MEC Weight
English Text:
VOC subsample 2 yr MEC Weight
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 to 325216.78843 Range of Values 3545 3545
. Missing 0 3545

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 3193 3193
. Missing 352 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3193 3193
2 detectable result and exceeds the calibrated range of assay 0 3193
. Missing 352 3545

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
0.0707 to 0.0707 Range of Values 3083 3083
. Missing 462 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3083 3083
2 detectable result and exceeds the calibrated range of assay 0 3083
. Missing 462 3545

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 3163 3163
. Missing 382 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3163 3163
2 detectable result and exceeds the calibrated range of assay 0 3163
. Missing 382 3545

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 0.056 Range of Values 3082 3082
. Missing 463 3545

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 Skip to Item
0 detectable result 11 11
1 below detectable limit 3071 3082
2 detectable result and exceeds the calibrated range of assay 0 3082
. Missing 463 3545

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 3140 3140
. Missing 405 3545

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 Comt Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 0 0
1 below detectable limit 3140 3140
2 detectable result and exceeds the calibrated range of assay 0 3140
. Missing 405 3545

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

Variable Name:
LBXV2E
SAS Label:
Blood 1,1,2-Trichloroethene (ng/mL)
English Text:
Blood 1,1,2-Trichloroethene(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 3165 3165
. Missing 380 3545

LBDV2ELC - Blood 1,1,2-Trichloroethene Comt Code

Variable Name:
LBDV2ELC
SAS Label:
Blood 1,1,2-Trichloroethene Comt Code
English Text:
Blood 1,1,2-Trichloroethene Comt Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 0 0
1 below detectable limit 3165 3165
2 detectable result and exceeds the calibrated range of assay 0 3165
. Missing 380 3545

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 to 0.0707 Range of Values 2998 2998
. Missing 547 3545

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 Comt
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 0 0
1 below detectable limit 2998 2998
2 detectable result and exceeds the calibrated range of assay 0 2998
. Missing 547 3545

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 0.079 Range of Values 3193 3193
. Missing 352 3545

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 Comt Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 1 1
1 below detectable limit 3192 3193
2 detectable result and exceeds the calibrated range of assay 0 3193
. Missing 352 3545

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
0.0354 to 0.0354 Range of Values 3148 3148
. Missing 397 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3148 3148
2 detectable result and exceeds the calibrated range of assay 0 3148
. Missing 397 3545

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 3131 3131
. Missing 414 3545

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

Variable Name:
LBDV4ELC
SAS Label:
Blood 1,1,2,2-Tetrachloroethane Com Code
English Text:
Blood 1,1,2,2-Tetrachloroethane Com Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 0 0
1 below detectable limit 3131 3131
2 detectable result and exceeds the calibrated range of assay 0 3131
. Missing 414 3545

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 40 Range of Values 2940 2940
. Missing 605 3545

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 Skip to Item
0 detectable result 482 482
1 below detectable limit 2458 2940
2 detectable result and exceeds the calibrated range of assay 0 2940
. Missing 605 3545

LBXVBF - Blood Bromoform (pg/mL)

Variable Name:
LBXVBF
SAS Label:
Blood Bromoform (pg/mL)
English Text:
Blood Bromoform (pg/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.7071 to 540 Range of Values 3016 3016
. Missing 529 3545

LBDVBFLC - Blood Bromoform Comment Code

Variable Name:
LBDVBFLC
SAS Label:
Blood Bromoform Comment Code
English Text:
Blood Bromoform Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 962 962
1 below detectable limit 2054 3016
2 detectable result and exceeds the calibrated range of assay 0 3016
. Missing 529 3545

LBXVBM - Blood Bromodichloromethane (pg/mL)

Variable Name:
LBXVBM
SAS Label:
Blood Bromodichloromethane (pg/mL)
English Text:
Blood Bromodichloromethane (pg/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.4384 to 93 Range of Values 3139 3139
. Missing 406 3545

LBDVBMLC - Blood Bromodichloromethane Comment Code

Variable Name:
LBDVBMLC
SAS Label:
Blood Bromodichloromethane Comment Code
English Text:
Blood Bromodichloromethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 2252 2252
1 below detectable limit 887 3139
2 detectable result and exceeds the calibrated range of assay 0 3139
. Missing 406 3545

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 2.5 Range of Values 3091 3091
. Missing 454 3545

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 Skip to Item
0 detectable result 1590 1590
1 below detectable limit 1501 3091
2 detectable result and exceeds the calibrated range of assay 0 3091
. Missing 454 3545

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 0.0078 Range of Values 3072 3072
. Missing 473 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3072 3072
2 detectable result and exceeds the calibrated range of assay 0 3072
. Missing 473 3545

LBXVCF - Blood Chloroform (pg/mL)

Variable Name:
LBXVCF
SAS Label:
Blood Chloroform (pg/mL)
English Text:
Blood Chloroform (pg/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1.4849 to 4200 Range of Values 3111 3111
. Missing 434 3545

LBDVCFLC - Blood Chloroform Comment Code

Variable Name:
LBDVCFLC
SAS Label:
Blood Chloroform Comment Code
English Text:
Blood Chloroform Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 2953 2953
1 below detectable limit 158 3111
2 detectable result and exceeds the calibrated range of assay 0 3111
. Missing 434 3545

LBXVCM - Blood Dibromochloromethane (pg/mL)

Variable Name:
LBXVCM
SAS Label:
Blood Dibromochloromethane (pg/mL)
English Text:
Blood Dibromochloromethane (pg/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.4384 to 60 Range of Values 3122 3122
. Missing 423 3545

LBDVCMLC - Blood Dibromochloromethane Comment Code

Variable Name:
LBDVCMLC
SAS Label:
Blood Dibromochloromethane Comment Code
English Text:
Blood Dibromochloromethane Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 1498 1498
1 below detectable limit 1624 3122
2 detectable result and exceeds the calibrated range of assay 0 3122
. Missing 423 3545

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 0.008 Range of Values 2979 2979
. Missing 566 3545

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 Skip to Item
0 detectable result 9 9
1 below detectable limit 2970 2979
2 detectable result and exceeds the calibrated range of assay 0 2979
. Missing 566 3545

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
0.0849 to 210 Range of Values 3126 3126
. Missing 419 3545

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 Skip to Item
0 detectable result 1455 1455
1 below detectable limit 1671 3126
2 detectable result and exceeds the calibrated range of assay 0 3126
. Missing 419 3545

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 0.088 Range of Values 3152 3152
. Missing 393 3545

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 Skip to Item
0 detectable result 2 2
1 below detectable limit 3150 3152
2 detectable result and exceeds the calibrated range of assay 0 3152
. Missing 393 3545

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
0.0057 to 0.038 Range of Values 3120 3120
. Missing 425 3545

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 Skip to Item
0 detectable result 1 1
1 below detectable limit 3119 3120
2 detectable result and exceeds the calibrated range of assay 0 3120
. Missing 425 3545

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 3.11 Range of Values 3119 3119
. Missing 426 3545

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 Skip to Item
0 detectable result 2218 2218
1 below detectable limit 901 3119
2 detectable result and exceeds the calibrated range of assay 0 3119
. Missing 426 3545

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 0.0078 Range of Values 3155 3155
. Missing 390 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3155 3155
2 detectable result and exceeds the calibrated range of assay 0 3155
. Missing 390 3545

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 18.7 Range of Values 2852 2852
. Missing 693 3545

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 Skip to Item
0 detectable result 13 13
1 below detectable limit 2839 2852
2 detectable result and exceeds the calibrated range of assay 0 2852
. Missing 693 3545

LBXVME - Blood MTBE (pg/mL)

Variable Name:
LBXVME
SAS Label:
Blood MTBE (pg/mL)
English Text:
Blood MTBE (pg/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.9899 to 3800 Range of Values 3080 3080
. Missing 465 3545

LBDVMELC - Blood MTBE Comment Code

Variable Name:
LBDVMELC
SAS Label:
Blood MTBE Comment Code
English Text:
Blood MTBE Comment Code
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 detectable result 2385 2385
1 below detectable limit 695 3080
2 detectable result and exceeds the calibrated range of assay 0 3080
. Missing 465 3545

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 4.19 Range of Values 3153 3153
. Missing 392 3545

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 Skip to Item
0 detectable result 2323 2323
1 below detectable limit 830 3153
2 detectable result and exceeds the calibrated range of assay 0 3153
. Missing 392 3545

LBXVST - Blood Styrene (ng/mL)

Variable Name:
LBXVST
SAS Label:
Blood Styrene (ng/mL)
English Text:
Blood Styrene (ng/mL)
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.0212 to 1 Range of Values 2808 2808
. Missing 737 3545

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 Skip to Item
0 detectable result 1120 1120
1 below detectable limit 1688 2808
2 detectable result and exceeds the calibrated range of assay 0 2808
. Missing 737 3545

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 1.4 Range of Values 3178 3178
. Missing 367 3545

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 Skip to Item
0 detectable result 52 52
1 below detectable limit 3126 3178
2 detectable result and exceeds the calibrated range of assay 0 3178
. Missing 367 3545

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 0.214 Range of Values 3085 3085
. Missing 460 3545

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 Skip to Item
0 detectable result 52 52
1 below detectable limit 3033 3085
2 detectable result and exceeds the calibrated range of assay 0 3085
. Missing 460 3545

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 30.4 Range of Values 3050 3050
. Missing 495 3545

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 Skip to Item
0 detectable result 2958 2958
1 below detectable limit 92 3050
2 detectable result and exceeds the calibrated range of assay 0 3050
. Missing 495 3545

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 11 Range of Values 3133 3133
. Missing 412 3545

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 Skip to Item
0 detectable result 3065 3065
1 below detectable limit 68 3133
2 detectable result and exceeds the calibrated range of assay 0 3133
. Missing 412 3545

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 0.77 Range of Values 3160 3160
. Missing 385 3545

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 Skip to Item
0 detectable result 582 582
1 below detectable limit 2578 3160
2 detectable result and exceeds the calibrated range of assay 0 3160
. Missing 385 3545

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
0.2121 to 0.2121 Range of Values 3144 3144
. Missing 401 3545

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 Skip to Item
0 detectable result 0 0
1 below detectable limit 3144 3144
2 detectable result and exceeds the calibrated range of assay 0 3144
. Missing 401 3545

VTQ210 - Attached garage?

Variable Name:
VTQ210
SAS Label:
Attached garage?
English Text:
Does your home have an attached garage?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1135 1135
2 No 2106 3241
7 Refused 0 3241
9 Don't know 2 3243
. Missing 302 3545

VTQ220 - Private well?

Variable Name:
VTQ220
SAS Label:
Private well?
English Text:
Is the source of water for your home from a private well?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 490 490
2 No 2705 3195
7 Refused 0 3195
9 Don't know 48 3243
. Missing 302 3545

VTQ230A - Toilet bowl deodorizers?

Variable Name:
VTQ230A
SAS Label:
Toilet bowl deodorizers?
English Text:
Do you use toilet bowl deodorizers inside your home?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1678 1678
2 No 1537 3215
7 Refused 0 3215
9 Don't know 28 3243
. Missing 302 3545

VTQ230B - Moth balls or crystals?

Variable Name:
VTQ230B
SAS Label:
Moth balls or crystals?
English Text:
Do you use moth balls or crystals inside your home?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 385 385
2 No 2815 3200
7 Refused 0 3200
9 Don't know 43 3243
. Missing 302 3545

VTQ240A - Pump gas into a car or motor vehicle?

Variable Name:
VTQ240A
SAS Label:
Pump gas into a car or motor vehicle?
English Text:
In the last three days, did you pump gas into your car or other motor vehicle yourself?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1252 1252
2 No 1989 3241
7 Refused 0 3241
9 Don't know 0 3241
. Missing 304 3545

VTQ240B - How long ago did you pump gas?

Variable Name:
VTQ240B
SAS Label:
How long ago did you pump gas?
English Text:
If, yes, how long ago, in hours, did you pump gas into a car?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 999 Range of Values 1252 1252
. Missing 2293 3545

VTQ250A - Spend time at swimming pool?

Variable Name:
VTQ250A
SAS Label:
Spend time at swimming pool?
English Text:
In the last three days, did you spend any time at a swimming pool, in a hot tub, or in a steam room?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 134 134
2 No 3106 3240
7 Refused 0 3240
9 Don't know 1 3241
. Missing 304 3545

VTQ250B - How long ago at swimming pool?

Variable Name:
VTQ250B
SAS Label:
How long ago at swimming pool?
English Text:
If, yes, how long ago, in hours, has it been since you spent time in a swimming pool, in a hot tub, or in a steam room?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2 to 72 Range of Values 134 134
. Missing 3411 3545

VTQ260A - Visit a dry cleaning shop?

Variable Name:
VTQ260A
SAS Label:
Visit a dry cleaning shop?
English Text:
In the last three days, did you visit a dry cleaning shop or wear clothes that had been dry-cleaned within the last week?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 278 278
2 No 2963 3241
7 Refused 0 3241
9 Don't know 0 3241
. Missing 304 3545

VTQ260B - Spend 10 minutes near cigarette smoke?

Variable Name:
VTQ260B
SAS Label:
Spend 10 minutes near cigarette smoke?
English Text:
In the last three days, did you spend 10 or more minutes near a person who was smoking a cigarette, cigar, or pipe?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 1187 1187
2 No 2054 3241
7 Refused 0 3241
9 Don't know 0 3241
. Missing 304 3545

VTQ270A - Take a hot shower?

Variable Name:
VTQ270A
SAS Label:
Take a hot shower?
English Text:
In the last three days, did you take a hot shower or bath for five minutes or longer?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 2846 2846
2 No 393 3239
7 Refused 0 3239
9 Don't know 2 3241
. Missing 304 3545

VTQ270B - How long since hot shower?

Variable Name:
VTQ270B
SAS Label:
How long since hot shower?
English Text:
If, yes, how long ago, in hours, has it been since your last shower or hot bath?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 to 999 Range of Values 2846 2846
. Missing 699 3545

VTQ280A - Breathe fumes from paints?

Variable Name:
VTQ280A
SAS Label:
Breathe fumes from paints?
English Text:
In the last three days, did you breath fumes from paints?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 224 224
2 No 3016 3240
7 Refused 0 3240
9 Don't know 1 3241
. Missing 304 3545

VTQ280B - Breathe fumes from degreasing cleaners?

Variable Name:
VTQ280B
SAS Label:
Breathe fumes from degreasing cleaners?
English Text:
In the last three days, did you breath fumes from degreasing cleaners?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 248 248
2 No 2992 3240
7 Refused 0 3240
9 Don't know 0 3240
. Missing 305 3545

VTQ280C - Breathe fumes from diesel fuel?

Variable Name:
VTQ280C
SAS Label:
Breathe fumes from diesel fuel?
English Text:
In the last three days, did you breath fumes from diesel fuel or kerosene?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 261 261
2 No 2978 3239
7 Refused 0 3239
9 Don't know 1 3240
. Missing 305 3545

VTQ280D - Breathe fumes from paint thinner?

Variable Name:
VTQ280D
SAS Label:
Breathe fumes from paint thinner?
English Text:
In the last three days, did you breath fumes from paint thinner, brush cleaner, or furniture stripper?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 120 120
2 No 3120 3240
7 Refused 0 3240
9 Don't know 0 3240
. Missing 305 3545

VTQ280E - Breathe fumes from drycleaning fluid?

Variable Name:
VTQ280E
SAS Label:
Breathe fumes from drycleaning fluid?
English Text:
In the last three days, did you breath fumes from drycleaning fluid or spot remover?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 114 114
2 No 3125 3239
7 Refused 0 3239
9 Don't know 1 3240
. Missing 305 3545

VTQ280F - Breathe fumes from fingernail polish?

Variable Name:
VTQ280F
SAS Label:
Breathe fumes from fingernail polish?
English Text:
In the last three days, did you breath fumes from fingernail polish or fingernail polish remover?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 554 554
2 No 2686 3240
7 Refused 0 3240
9 Don't know 0 3240
. Missing 305 3545

VTQ280G - Breathe fumes from glue?

Variable Name:
VTQ280G
SAS Label:
Breathe fumes from glue?
English Text:
In the last three days, did you breath fumes from glues or adhesives used for hobbies or crafts?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 180 180
2 No 3059 3239
7 Refused 0 3239
9 Don't know 1 3240
. Missing 305 3545

VTQ280H - Breathe fumes from varnish?

Variable Name:
VTQ280H
SAS Label:
Breathe fumes from varnish?
English Text:
In the last three days, did you breath fumes from varnish or stain?
Target:
Both males and females 12 YEARS - 150 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 49 49
2 No 3191 3240
7 Refused 0 3240
9 Don't know 0 3240
. Missing 305 3545