Table of Contents

Component Description

The current National Health and Nutrition Examination Survey (NHANES) is a continuous program starting in 1999. The survey interviews and examines a nationally representative sample of 5,000 persons each year. These persons are located in counties across the country, 15 of which are visited each year. No geographic location was released in order to protect the identification of respondents for the NHANES survey. State and county information could be obtained through the Research Data Center (RDC). It is desirable, however, to use a finer level of geography to spatially analyze the NHANES data and to answer various important research questions about the effect of geography on health.

Therefore, National Center for Health Statistics (NCHS) entered into an agreement with U.S. Department of Housing and Urban Development (HUD) to use its geocoding services to assign geographic codes to the NHANES address data. HUD geocoded the 1999-2016 NHANES survey data to the 2000 and 2010 censuses, respectively.

Eligible Sample

All survey participants have a geocoded record.

Interview Setting and Mode of Administration

NHANES collects residential household information for unique addresses of households containing at least one survey participant. 

Quality Assurance & Quality Control

After geocoding the NHANES survey data HUD provides QC documentation (see Appendix 1).

Data Processing and Editing

The NHANES’ participants address data was submitted to HUD and using Geocode Service Center (GSC), was geo-enabled with latitude/longitude coordinates and other legal, statistical, and administrative geographies including census, postal, and other attributes.

Analytic Notes

Due to disclosure issues, this dataset is not available publicly. Access may be obtained through the NCHS Research Data Center (https://www.cdc.gov/rdc).

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 0 YEARS - 150 YEARS

RC2KX - Census 2010 Geocoder General Return Code

Variable Name:
RC2KX
SAS Label:
Census 2010 Geocoder General Return Code
English Text:
Reference Census 2010 Geocoder RCs (Return Codes) tab
Target:
Both males and females 0 YEARS - 150 YEARS

STM2KX - Census 2010 Geocoder Street Matcher RC

Variable Name:
STM2KX
SAS Label:
Census 2010 Geocoder Street Matcher RC
English Text:
Census 2010 Geocoder Street Matcher Return Code
Target:
Both males and females 0 YEARS - 150 YEARS

LVL2KX - Census 2010 Geocoder LAT/LONG Geocoding

Variable Name:
LVL2KX
SAS Label:
Census 2010 Geocoder LAT/LONG Geocoding
English Text:
Reference Census 2010 Geocoder RCs (Return Codes) tab
Target:
Both males and females 0 YEARS - 150 YEARS

LAT - Latitude (Decimal)

Variable Name:
LAT
SAS Label:
Latitude (Decimal)
English Text:
Latitude in decimal format with up to 6 decimal precision
Target:
Both males and females 0 YEARS - 150 YEARS

LON - Longitude (Decimal)

Variable Name:
LON
SAS Label:
Longitude (Decimal)
English Text:
Longitude in decimal format with up to 6 decimal precision
Target:
Both males and females 0 YEARS - 150 YEARS

STATE2KX - Census 2010 FIPS State Code

Variable Name:
STATE2KX
SAS Label:
Census 2010 FIPS State Code
English Text:
Census 2010 FIPS State Code (2-digit numeric with leading zeros significant)
Target:
Both males and females 0 YEARS - 150 YEARS

CNTY2KX - Census 2010 FIPS County Code

Variable Name:
CNTY2KX
SAS Label:
Census 2010 FIPS County Code
English Text:
Census 2010 FIPS County Code (3-digit numeric with leading zeros significant)
Target:
Both males and females 0 YEARS - 150 YEARS

CBSA - Core Based Statistical Area (CBSA)

Variable Name:
CBSA
SAS Label:
Core Based Statistical Area (CBSA)
English Text:
CBSA Lowest Level Code. Contains the first of: Metropolitan Division; Micropolitan Area; Metropolitan Area; in this order
Target:
Both males and females 0 YEARS - 150 YEARS

UR2KX - Urban/Rural Indicator

Variable Name:
UR2KX
SAS Label:
Urban/Rural Indicator
English Text:
Urban/Rural Indicator (U = Urban, R = Rural, blank = unknown) [TIGER/Line RcdType 'S'; UR value]
Target:
Both males and females 0 YEARS - 150 YEARS

TRACT2KX - Census 2010 Tract

Variable Name:
TRACT2KX
SAS Label:
Census 2010 Tract
English Text:
Census 2010 Tract (contains leader zeros with the decimal point implied)
Target:
Both males and females 0 YEARS - 150 YEARS

BG2KX - Census 2010 Block Group

Variable Name:
BG2KX
SAS Label:
Census 2010 Block Group
English Text:
Census 2010 Block Group
Target:
Both males and females 0 YEARS - 150 YEARS

BLOCK2KX - Census 2010 Block ID

Variable Name:
BLOCK2KX
SAS Label:
Census 2010 Block ID
English Text:
Census 2010 Block ID - first character is the Census Block Group
Target:
Both males and females 0 YEARS - 150 YEARS

Appendix 1. 1999-2016 GCP Match Census 2010

CENSUS 2010 GEOCODER GENERAL RETURN CODE
RC2KX Frequency Percent Cumulative Frequency Cumulative Percent
35 0.04 35 0.04
5 2685 2.92 2720 2.95
9 2921 3.17 5641 6.13
S 86421 93.87 92062 100.00

 

CENSUS 2010 GEOCODER LAT/LONG GEOCODING LEVEL RETURN CODE
LVL2KX Frequency Percent Cumulative Frequency Cumulative Percent
35 0.04 35 0.04
4 1316 1.43 1351 1.47
B 1605 1.74 2956 3.21
R 86421 93.87 89377 97.08
T 2685 2.92 92062 100.00