![NCHS home page graphic and link](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/nchshd.jpg)
National
Ambulatory Medical Care
Survey (NAMCS)
Description
National
Hospital Ambulatory Medical Care Survey (NHAMCS)
Description
Data
Highlights - Selected Tables, Charts, and Graphics
Physician
Office Visit Data
Outpatient
Department Visit Data
Emergency
Department Visit Data
Ambulatory
Care Data from Health, United States, 2006
Survey
Methodology
An
overview of the 2005 survey methodology is presented here. Please note
that complete survey documentation for all survey years can be easily downloaded
using the link under Public-Use Data Files, below.
Survey Instrument
NAMCS
NHAMCS
Scope and sample design
NAMCS
NHAMCS
Data collection and processing
NAMCS
NHAMCS
Estimation procedures
NAMCS
NHAMCS
Reliability of survey estimates
NAMCS
NHAMCS
Classification systems used with the NAMCS and NHAMCS
International
Classification of Diseases
National
Drug Code Directory
Reason for
Visit Classification, Drug Entry List, Generic Ingredient List: These
classifications are updated on an annual basis and printed in the documentation
for each survey year. In addition, text formats for reason for visit, drug
entry, and generic ingredient codes are all available in downloadable SAS
formats for data years 1993-2006 and SPSS syntax files for
2002-2006. The SAS and SPSS formats also include text labels for the following
codes: diagnosis, cause of injury, procedures, and therapeutic class of
drug.
List of survey items, 1973-2006
NAMCS
and NHAMCS Survey Content Brochure
NAMCS
NHAMCS
Publications
using NAMCS/NHAMCS
data
NAMCS/NHAMCS
Publications List - This contains a complete chronological listing of
citations for all NCHS reports, journal articles, and other publications
using NAMCS and NHAMCS data. It is meant to be a reference document and
does not provide links to downloadable reports.
![click to open pdf 187 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/pdf.jpg)
Downloadable
NCHS Reports - Selected NCHS reports are listed here, which can be
viewed or downloaded.
Public-Use
Data Files (micro-data) (1973-2006)
Downloadable data files:
Notice: Currently, NAMCS
and NHAMCS public-use files for 1993-2006 contain sample design variables in
masked form. The initial release of the 2000-2006 public-use files included
masked sample design variables. We re-released the 1993-99 NAMCS and NHAMCS
files to include these variables. For re-released files, file names and
layouts are essentially the same, but the design variables were appended to
each file according to a generic file layout that is available for
downloading below. Public-use files for previous years of data will be
re-released with masked sample design variables on an ongoing basis.
However, data users should note
that, beginning with the 2002 public use files, two new masked design
variables were added to the file, for use with statistical software that
assumes a single stage of sampling. For the 2003 public use files
and beyond, the
decision was made to include only these two masked design variables
for variance estimation.
Therefore, data users who wish to combine years of data from 2003
and beyond with
years prior to 2002 will need to create these two variables for each file
prior to 2002. A technical paper, Using Ultimate Cluster Models with
NAMCS and NHAMCS Public Use Files, gives instructions.
![click to open pdf file 34 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/pdf.jpg)
NAMCS,
1993-2006
NAMCS,
1973-1992
NHAMCS,
1992-2006
Public
Use Data File Updates
Downloadable documentation:
Notice:
For data years 1993-99, be sure to download not only the original
file documentation for each year, but also the supplemental files that
explain the new sample design variables that have been added to each
file. The supplemental files also include descriptions of any revisions
that may have been made to the original data files.
NAMCS,
1993-2006
NAMCS,
1973-1992
NHAMCS,
1992-2006
Documentation
Updates
Methodology
Used to Create "Initial Visit" for 2005 and 2006 NHAMCS
NAMCS and NHAMCS data can also be downloaded
from the Inter-University Consortium for Political and Social Research
(ICPSR).
SAS Documentation:
Notice:
We now have SAS input statements, variable labels, value labels,
and format assignments available for NAMCS and NHAMCS data years 1993-2006.
NAMCS
SAS
Input Statements
SAS Variable Labels
and Format Assignments
SAS Value Labels
NHAMCS
SAS
Input Statements
SAS Variable Labels
and Format Assignments
SAS Value Labels
SAS
Code to Produce Aggregated Visit Statistics at the Physician or Facility
Level
![Click to open pdf file 34 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/pdf.jpg)
SPSS Documentation:
NAMCS
NHAMCS
Stata Documentation and
Datasets:
NAMCS
NHAMCS
Data on CD-ROM:
NAMCS
(1990-2005)
NHAMCS
(1992-2005)
Notice:
1995-96 CD-ROM Users
Data on public-use tape:
NAMCS
(1973-97)
NHAMCS
(1992-97)
Additional NAMCS and
NHAMCS Data Available at the Research Data Center
The
NAMCS and NHAMCS datasets that are available to approved users of the
NCHS Research Data Center contain
additional variables not included on the public use datasets. ![Click to open pdf file 32 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/pdf.jpg)
Ambulatory
Care Drug Database System
Trend Analysis Using NAMCS and NHAMCS Drug Data
Census
2000 Population Estimates - How Do They Affect Visit Rates?
Staff
Presentations
2008 Data Users
Conference Presentations
Patient
Characteristics and the Use of Health Care Services by Persons with HIV
by Esther Hing and Christine Lucas
![Click to open ppt file 683](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Mental
Health Data from the NAMCS and NHAMCS
by Susan M. Schappert
![Click to open ppt file 1852 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Overview
of the NAMCS and NHAMCS by Linda McCaig
and David Woodwell
![Click to open ppt file 610 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Understanding
and Using NAMCS and NHAMCS Data: Data Tools and Basic Programming Techniques
by Donald Cherry![Click to open ppt file 529 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SAS
Exercises
Understanding
and Using NAMCS and NHAMCS Data: A Hands-On Workshop Part II Advanced
Programming Techniques
by Esther Hing
![Click to open ppt file 2880 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SAS
Exercises
Using
NAMCS and NHAMCS Drug Data: A Hands-On Workshop
by Susan M. Schappert
and Elizabeth A.
Rechsteiner
![Click to open ppt file 566 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SAS
Exercises
2006 Data Users
Conference Presentations
Analyzing
Data from the NAMCS and the NHAMCS
by Linda McCaig and David Woodwell
![Click to open ppt file 6.62 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Understanding
and Using NAMCS and NHAMCS Data: A Hands-On Workshop (Part 1)
by Susan Schappert
![Click to open ppt file 6.44 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SETS Workbook
Understanding
and Using NAMCS and NHAMCS Data: A Hands-On Workshop (Part 2 – Using
Public Use Data Files)
by Eric Nawar
![Click to open ppt file 523 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SAS,
SUDAAN, and Stata Exercises
Medication
Data from Nationally Representative Provider and Population-Based Surveys
by Lisa Dwyer, Saeid Raofi, Karen Lees, and Ryne Paulose
![Click to open ppt 4.95 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
2004 Data Users
Conference Presentations
Overview
of the NAMCS and NHAMCS
by Linda McCaig and David Woodwell
![Click to open ppt 7.11 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Understanding
and Using NAMCS and NHAMCS Data: A Hands-On Workshop (Part 1)
by Susan Schappert
![Click to open ppt 2.96 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SETS Workbook
Understanding
and Using NAMCS and NHAMCS Data: A Hands-On Workshop (Part 2 – Using
Raw-Data Files)
by Don Cherry
![Click to open ppt 532 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
SAS and SUDAAN
Exercises
Using
NAMCS Data for Injury Analysis
by Linda McCaig
![Click to open ppt 1.79 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Characteristics
of EDs Serving High Volumes of Safety Net Patients
by Catharine Burt
![Click to open ppt 14.9 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Using
Past Visit Information to Enhance Analysis of NAMCS Data
by Catharine Burt
![Click to open pdf file 155 KB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/pdf.jpg)
Translating
Visits into Patients Using Ambulatory Visit Data
by Esther Hing and Julia Holmes
![Click to open ppt 1.00 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Women’s
Health: Data from the NAMCS and NHAMCS
by Esther Hing
![Click to open ppt 0.98 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Analyzing
Data on Medications Collected in the National Health Care Survey
by Catharine Burt
![Click to ope ppt 6.54 MB](https://webarchive.library.unt.edu/eot2008/20090506001215im_/http://www.cdc.gov/nchs/images/ppt.jpg)
Confidentiality
of NAMCS and NHAMCS Data
Frequently
Asked Questions (FAQ's)
Links
to Related Sites
American
College of Emergency Physicians
American
College of Osteopathic Emergency Physicians American
Hospital Association
American
Medical Association
American
Osteopathic Association
Data
Elements for ED Systems
Emergency
Nurses Association
Federation
of American Hospitals
Injury-ICE
National
Center for Injury Prevention & Control
Society
for Academic Emergency Medicine
This page last reviewed
February 23, 2009
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