Table of Contents

Locator Record

Title: Lead Dust (LAB20 )
Contact Number: 1-866-441-NCHS
Years of Content: 1999 - 2000
First Published: June, 2006
Revised: NA
Access Constraints: None
Use Constraints: None
Geographic Coverage: National
Subject:Lead Dust
Record Source: NHANES 1999 - 2000
Survey Methodology: NHANES 1999 - 2000 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

Lead is a known environmental toxin that has been shown to deleteriously affect the nervous, hematopoietic, endocrine, renal, and reproductive systems. In young children, lead exposure is a particular hazard because children more readily absorb lead than do adults, and children's developing nervous systems also make them more susceptible to the effects of lead. Since first measuring blood lead during the 1976–1980 survey, NHANES has been the cornerstone for lead exposure surveillance in the U.S.

In 1999, NHANES began to collect dust samples from the homes of children 1–5 years of age to be tested for the presence of lead. Lead in dust is most often the result of old, peeling, or chipping lead-based paint. As part of the household visit, NHANES interviewers collected separate dust-wipe samples from the floor and window sill of one room in the home. Signing of a special informed consent was required prior to the collection.

Eligible Sample

Eligible survey participants were households with children 1–5 years of age.

Description of Laboratory Methodology

The preparation procedure for dust-wipe sample digestion involves the quantitative transfer of the sample from the container into a beaker, and then the subsequent addition of nitric and hydrochloric acids and hot-plate heating. The procedure is described in the Appendix of the Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing (1). The technique does not involve complete digestion of the sample, but does entail leaching of the lead (Pb) from the collected dust. Recovery of the method is based and evaluated on the results of matrix (wipe) spiked National Institute of Standards and Technology (NIST) quality control samples. The lead content of the digestate is determined by using a PerkinElmer Flame Atomic Absorption Spectrometer (FAAS) Model 5000 or 5100 for all window dust-wipe samples and a PerkinElmer Graphite Furnace Atomic Absorption Spectrometer (GFAAS) Model 5100 for all floor dust-wipe samples. However, a floor dust sample whose value was found to be 5 μg or greater by GFAAS are re-analyzed by FAAS and that value is reported.

Data Processing and Editing

Detailed specimen collection instructions are discussed in the NHANES Household Interview Procedures Manual, Chapter 7. This chapter specifies the procedure to be used for preparation of the window and floor, specimen collection, labeling, and conditions for specimen transport.

Laboratory Quality Assurance and Monitoring

Additional dust samples (either window sill or floor) were taken in 5% of households as part of the quality control procedures. A field blank was also collected. Results from these quality control measures are not included as part of this data file.

For the year 2000, the floor samples (n=30) had a 99.8% (+/-2.1%) recovery at an average spike level of 75.31 (sd 14.29) μg. The window sill samples (n=29) revealed a 99.8% (+/-2.9%) recovery at an average spike level of 74.94 (sd 18.77)μg. This data is not available for 1999.

Analytic Notes

This data file includes the laboratory values as well as variables related to characteristics of the room where the samples were taken, and other factors relevant to data collection.

DCDINDEX

The variable identifies the index child designated for dust collection. Descriptive data about the home environment and the dust samples were collected for one child in the household. In homes where more than one child aged 1-5 years resided, the descriptive and laboratory data for the index child were assigned to all other children in the age group.

DCDSTAT

This variable indicates which samples are available. In some households, only a single sample (either window sill or floor) was taken. This variable was derived based on final results from the laboratory.

DCD030

The room where the sample was taken was most often the same room where the child spent most of his or her time in the home. In editing this variable, some responses from the "other" category were re-coded to pre-existing categories, and additional categories were created.

DCD070A

Carpet in room selected for sample. Response categories ordering from the original question were reordered for purposes of clarification and consistency.

It is advised that this data file should be combined with additional years of data because data are available on a small subset of the survey population. This data file was designed to be used primarily at the SP level with other data collected in the MEC. Please note, data were retained for persons who took part in the household interview (including dust collection) but were not examined at the MEC.

LBXDFS

Floor sample, lead dust result (μg/sq ft), by GFAAS. All floor dust results are derived from a 1 square foot area, the size of the template used for the sample collection. If a floor sample was collected but the result is missing for LBXDFS, use LBXDFSF. Use LBDDFSLC, the laboratory comment code, to determine values below the limit of detection.

LBXDFSF

Floor sample, lead dust result μg/sq ft) by FAAS. All floor dust results are derived from a 1 square foot area, the size of the template used for the sample collection. If a floor sample was collected but the result is missing for LBXDFSF, use LBXDFS. Use LBDD3LC, the laboratory comment code, to determine values below the limit of detection.

LBXDDWS

Window sill sample, lead dust result (μg/sq ft). All window sill dust results were calculated based on the measured length and width of the window sill area. Use LBDDWSLC, the laboratory comment code, to determine values below the limit of detection.

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 1 YEARS - 5 YEARS

DCDINDEX - Index child for sampling

Variable Name:
DCDINDEX
SAS Label:
Index child for sampling
English Text:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Primary Child 795 795
2 Other Household Child 290 1085
. Missing 0 1085

DCDSTAT - Dust sample status

Variable Name:
DCDSTAT
SAS Label:
Dust sample status
English Text:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Floor Only 191 191
2 Window Only 0 191
3 Floor and Window 798 989
. Missing 96 1085

DCD030 - Room where samples taken

Variable Name:
DCD030
SAS Label:
Room where samples taken
English Text:
Room where samples taken
English Instructions:
ENTER LOCATION OF SAMPLE
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
2 Living Room/Family Room/Den 823 823
3 Dining Room 13 836
4 Kitchen 14 850
5 Bedroom 115 965
7 Another room 24 989
. Missing 96 1085

DCD070A - Room selected was floor carpeted

Variable Name:
DCD070A
SAS Label:
Room selected was floor carpeted
English Text:
Indicates whether floor was carpeted in room-floor sample
English Instructions:
ENTER ROOM CARPET CODE: CAPI EDIT: IF "NO CARPET" (CODE 2) IS SELECTED, NO OTHER CODE MAY BE SELECTED.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 794 794
2 No 195 989
. Missing 96 1085

DCQ070B - Room selected had floor mat

Variable Name:
DCQ070B
SAS Label:
Room selected had floor mat
English Text:
Indicates whether mat was found in room-floor sample
English Instructions:
ENTER ROOM CARPET CODE: CAPI EDIT: IF "NO CARPET" (CODE 2) IS SELECTED, NO OTHER CODE MAY BE SELECTED.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 13 13
2 No 976 989
. Missing 96 1085

DCQ070C - Room selected had area rug

Variable Name:
DCQ070C
SAS Label:
Room selected had area rug
English Text:
Indicates whether area rug was found in room-floor sample
English Instructions:
ENTER ROOM CARPET CODE: CAPI EDIT: IF "NO CARPET" (CODE 2) IS SELECTED, NO OTHER CODE MAY BE SELECTED.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 141 141
2 No 848 989
. Missing 96 1085

DCQ070D - Room selected had wall-wall carpeting

Variable Name:
DCQ070D
SAS Label:
Room selected had wall-wall carpeting
English Text:
If there was wall to wall carpet-floor sample
English Instructions:
ENTER ROOM CARPET CODE: CAPI EDIT: IF "NO CARPET" (CODE 2) IS SELECTED, NO OTHER CODE MAY BE SELECTED.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 705 705
2 No 284 989
. Missing 96 1085

DCQ090 - Carpet pile depth

Variable Name:
DCQ090
SAS Label:
Carpet pile depth
English Text:
Depth of carpeting-floor sample
English Instructions:
ENTER CARPET PILE DEPTH:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Low pile 661 661
2 High pile 101 762
3 Not applicable 32 794
. Missing 291 1085

DCQ160 - Surface condition for floor dust sample

Variable Name:
DCQ160
SAS Label:
Surface condition for floor dust sample
English Text:
Surface condition for floor dust sample
English Instructions:
CAPI EDIT: IF "NO CARPET" (CODE 2) HAS BEEN SELECTED IN DCD.070, DO NOT ALLOW SELECTION OF "CARPETED" (CODE 3) IN DCQ.160.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Smooth and Cleanable 216 216
2 Not Smooth and Cleanable 9 225
3 Carpet 59 284
. Missing 801 1085

DCQ240 - Window sill finished

Variable Name:
DCQ240
SAS Label:
Window sill finished
English Text:
Window sill finished
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Yes 697 697
2 No 101 798
. Missing 287 1085

DCQ250 - Surface condition for sill dust sample

Variable Name:
DCQ250
SAS Label:
Surface condition for sill dust sample
English Text:
Surface condition for sill dust sample
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Smooth and Cleanable 704 704
2 Not Smooth and Cleanable 94 798
. Missing 287 1085

DCQ400 - Room cleanliness

Variable Name:
DCQ400
SAS Label:
Room cleanliness
English Text:
INTERVIEWER OBSERVATION: ROOM CLEANLINESS
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Dirtier than average 139 139
2 Average 616 755
3 Cleaner than average 234 989
. Missing 96 1085

DCQ410 - Room clutter

Variable Name:
DCQ410
SAS Label:
Room clutter
English Text:
INTERVIEWER OBSERVATION: ROOM CLUTTER
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
1 Very cluttered (nothing in place) 118 118
2 Average amount of clutter 594 712
3 Organized (nothing out of place) 277 989
. Missing 96 1085

LBXDFS - Floor, GFAAS (ug/sq.ft.)

Variable Name:
LBXDFS
SAS Label:
Floor, GFAAS (ug/sq.ft.)
English Text:
Floor result in micrograms per square feet by graphite furnace atomic absorption spectrophotometric method.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.11 to 9.02 Range of Values 902 902
. Missing 183 1085

LBXDFSF - Floor, FAAS (ug/sq. ft.)

Variable Name:
LBXDFSF
SAS Label:
Floor, FAAS (ug/sq. ft.)
English Text:
Floor result in micrograms per square feet by flame atomic absorption spectrophotometric method.
English Instructions:
If the floor sample result by the GFAAS method is >5 then it is measured by the FAAS method. Only the FAAS method result is reported.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.11 to 102.3 Range of Values 87 87
. Missing 998 1085

LBDDWS - Window, FAAS (ug/sq. ft.)

Variable Name:
LBDDWS
SAS Label:
Window, FAAS (ug/sq. ft.)
English Text:
Window result in micrograms per square feet by flame atomic absorption spectrophotometric method.
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0.38 to 7650 Range of Values 798 798
. Missing 287 1085

LBDDFSLC - Lead dust floor (GFAAS) comment code

Variable Name:
LBDDFSLC
SAS Label:
Lead dust floor (GFAAS) comment code
English Text:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above limit of detection 798 798
1 Below limit of detection 104 902
. Missing 183 1085

LBDD3LC - Lead dust floor (FAAS) comment code

Variable Name:
LBDD3LC
SAS Label:
Lead dust floor (FAAS) comment code
English Text:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above limit of detection 84 84
1 Below limit of detection 3 87
. Missing 998 1085

LBDDWSLC - Lead dust window sill comment code

Variable Name:
LBDDWSLC
SAS Label:
Lead dust window sill comment code
English Text:
Target:
Both males and females 1 YEARS - 5 YEARS
Code or Value Value Description Count Cumulative Skip to Item
0 At or above limit of detection 496 496
1 Below limit of detection 302 798
. Missing 287 1085