National Hospital Ambulatory Medical Care Survey, 1997 (ICPSR 2740)
Published: Jan 18, 2006 View help for published
Summary View help for Summary
The National Hospital Ambulatory Medical Care Survey (NHAMCS) was inaugurated in 1992 to fill a gap in data about ambulatory medical care in the United States. Although the National Ambulatory Medical Care Survey collects annual data on patient visits to physician offices, it excludes the hospital emergency room and outpatient department visits that make up a large part of the total ambulatory care received each year. The NHAMCS provides data from samples of patient records selected from emergency departments (EDs) and outpatient departments (OPDs) of a national sample of hospitals. The resulting national estimates describe the use of hospital ambulatory medical care services in the United States. For the 1997 survey, data were collected from 236 OPDs and 395 EDs. Among the variables included are age, race, and sex of the patient, reason for the visit, physician's diagnoses, cause of injury (ED only), surgical procedures (OPD only), medication therapy, and expected source of payment.
Citation View help for Citation
Subject Terms View help for Subject Terms
Geographic Coverage View help for Geographic Coverage
Restrictions View help for Restrictions
In preparing the data files for this collection, the National Center for Health Statistics (NCHS) has removed direct identifiers and characteristics that might lead to identification of data subjects. As an additional precaution NCHS requires, under Section 308(d) of the Public Health Service Act (42 U.S.C. 242m), that data collected by NCHS not be used for any purpose other than statistical analysis and reporting. NCHS further requires that analysts not use the data to learn the identity of any persons or establishments and that the director of NCHS be notified if any identities are inadvertently discovered. ICPSR member institutions and other users ordering data from ICPSR are expected to adhere to these restrictions.
Time Period(s) View help for Time Period(s)
Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
Per agreement with NCHS, ICPSR distributes the data files and text of the technical documentation for this collection as prepared by NCHS. The codebook is provided as a Portable Document Format (PDF) files. The PDF file format was developed by Adobe Systems Incorporated and can be accessed using PDF reader software, such as the Adobe Acrobat Reader. Information on how to obtain a copy of the Acrobat Reader is provided through the ICPSR Website on the Internet.
Sample View help for Sample
The NHAMCS used a four-stage probability design with samples of PSUs, hospitals within PSUs, clinics within hospitals, and patient visits within clinics.
Universe View help for Universe
Visits to the emergency and outpatient departments of noninstitutional general and short-stay hospitals within the 50 states and the District of Columbia that had an average length of stay of less than 30 days, or hospitals whose specialty was general (medical or surgical) or children's general. Excluded were federal hospitals, hospital units within institutions, and hospitals with less than six beds staffed for patient use.
Data Source View help for Data Source
patient visit records from hospital emergency departments and outpatient departments
Data Type(s) View help for Data Type(s)
Original Release Date View help for Original Release Date
Version Date View help for Version Date
Version History View help for Version History
- U.S. Dept. of Health and Human Services, National Center for Health Statistics. NATIONAL HOSPITAL AMBULATORY MEDICAL CARE SURVEY, 1997. ICPSR version. Hyattsville, MD: U.S. Dept. of Health and Human Services, National Center for Health Statistics [producer], 1999. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 1999. http://doi.org/10.3886/ICPSR02740.v1
2006-01-18 File CB2740.ALL.PDF was removed from any previous datasets and flagged as a study-level file, so that it will accompany all downloads.
The public-use data files in this collection are available for access by the general public. Access does not require affiliation with an ICPSR member institution.
- The citation of this study may have changed due to the new version control system that has been implemented.
This study is maintained and distributed by the National Archive of Computerized Data on Aging (NACDA), the aging program within ICPSR. NACDA is sponsored by the National Institute on Aging (NIA) at the National Institutes of Heath (NIH).